Last hurrah for the Eastern Conference as we know it?

For the past half-decade, the same rotating cast of characters has largely dominated the Eastern Conference. From Kevin Garnett and Paul Pierce to Derrick Rose and Paul George, they all have one thing in common: They were no match for whichever team LeBron James was on at the time.

A James-led squad has advanced to the NBA Finals in five straight seasons, and given the current composition of the East’s top contenders, he’ll likely be heading back there in June once again. En route to each of those Finals appearances, James often found himself crossing paths with familiar faces, clashing with the aforementioned players three times apiece.

Considering how top-heavy the East has been since the 2010-11 season, James’ repetition of opponents should come as little surprise. Over that span, only seven of the conference’s franchises have won at least two playoff series, while eight have earned two or fewer playoff berths. Though the Detroit Pistons are the only East team not to make a single playoff appearance within the past half-decade, the Toronto Raptors, Milwaukee Bucks, Charlotte Hornets and Orlando Magic all failed to advance past the first round despite two postseason berths apiece.

The familiarity with opponents has helped breed hostility, particularly between the Chicago Bulls and James—who could ever forget Joakim Noah’s “Hollywood as hell” comment or him putting Cleveland on blast?—but 2015-16 is shaping up as the last hurrah for many of the East’s top challengers. The teams that have waged war against James over the past-half decade have either already begun radical organizational overhaul, or they face a great deal of offseason uncertainty.

Take Rose’s Bulls, for instance. Even prior to the season-ending shoulder injury Joakim Noah suffered Friday, the 2015-16 campaign figured to be the last go-round for this particular core. Noah is set to become an unrestricted free agent this summer, while Pau Gasol is “very likely” to decline his player option and join Noah in free agency, according to CSN Chicago’s Vincent Goodwill. The Bulls’ once-bruising frontcourt could suddenly be down to Taj Gibson, Bobby Portis and Nikola Mirotic, posing much less of an existential threat to James and the Cavs in a playoff series. Rose might not be long for Chicago, either, as his contract expires following the 2016-17 season. Though Jimmy Butler and LeBron figure to wage plenty of one-on-one wars over the next few seasons, the ethos of this Bulls team could be far different in a year’s time.

The Miami Heat likewise face a potential reinvention following the 2015-16 season, as both Dwyane Wade and Hassan Whiteside are set to become unrestricted free agents. Just last year, rumors bubbled about Wade’s willingness to leave the only NBA team he’s ever played for due to contentious contract negotiations. While cooler heads ultimately prevailed, and the 11-time All-Star signed a one-year, $20 million deal with Miami, things could get even messier this time around if he’s unwilling to take even a slight pay cut. The Heat are in an even trickier spot with Whiteside, as they don’t own his Bird rights, giving them no financial advantage over any other free-agent suitors. A whopping eight of Miami’s 15 players will be unrestricted free agents this summer, per Spotrac, meaning the Heat team that takes the court in 2016-17 will almost assuredly look far different than this year’s squad.

The Atlanta Hawks and Toronto Raptors are also in danger of losing franchise cornerstones, as Al Horford is set to become an unrestricted free agent for the first time in his career, while DeMar DeRozan is “likely” to decline his player option worth just over $10 million, per Brian Lewis of the New York Post. Both former All-Stars are near-locks to receive max contracts, as the impending salary-cap boom will drastically inflate the value of all deals signed this summer. Though each could easily wind up re-signing with his incumbent team, an early playoff exit could make Horford or DeRozan consider fleeing to greener pastures.

As each of these four top challengers confronts a potentially drastic shakeup this offseason, others have already begun a reinvention. The Pacers, for instance, opted to abandon their frontcourt-centric style this past summer, trading Roy Hibbert and allowing David West to walk in free agency, all while signing Monta Ellis and morphing into a small-ball-oriented squad. While George initially expressed skepticism about the change, it didn’t take him long to come around to Indiana’s new identity. He’s now in the midst of a career year and the rebuilding Pacers find themselves in the playoff chase.

The Celtics also find themselves in the middle of a revamp, having traded away Pierce, Garnett and Rajon Rondo—the three remaining relics of their late-2000s Big Three era—within the past two-and-a-half years. Through those deals, general manager Danny Ainge accrued a war chest of future draft picks and tantalizing young players, ensuring few teams could one-up him if a disgruntled superstar ever winds up on the trade block. In the meantime, Ainge acquired veterans such as Jae Crowder and Isaiah Thomas to ensure that Boston would remain competitive while working its way back from its Pierce-Garnett-Ray Allen peak.

If the playoffs began on Wednesday, both Indiana and Boston would be in, with the Celtics matching up against Cleveland in the opening round. Sandwiched in between them would be the Pistons, whose six-year playoff drought appears to be in danger thanks to the electric duo of Reggie Jackson and Andre Drummond. Right below Boston are the Magic, New York Knicks, Washington Wizards and Hornets, all of whom have at least two legitimate studs to build around over the coming years. Though none of these squads appear ready to challenge James and the Cavaliers for Eastern Conference supremacy this spring, each would currently be a playoff team if they played in the West. (That’s not to mention the Bucks, who have regressed this year after a shocking 41-win campaign in 2014-15.)

Ultimately, only two teams in the East have a lengthy road ahead when it comes to building a playoff contender—the Philadelphia 76ers and Brooklyn Nets. Even the Sixers could jumpstart their rebuild should the lottery gods smile upon them this May, giving them the No. 1 overall pick Add Ben Simmons and Kris Dunn to the Nerlens Noel-Jahlil Okafor-Joel Embiid-Dario Saric core and the Sixers suddenly look poised to shoot up the standings, leaving Brooklyn as the only East franchise with a significantly uncertain future.

While there are certainly plenty of moving pieces, the times, they certainly are a changing.