The NFL isn’t against making changes in regards to some of their current issues. One of which could be eliminating extra points. Another could be adding additional reviews of fumbles. And of course, another would be expanding the playoffs.
However, NFL Commissioner Roger Goodell said expanding the playoffs is unlikely – at least for now as he doesn’t suspect anything to get in that regard until at least after the 2015 season.
Per Pro Football Talk:
"Goodell acknowledged that there are plenty of issues to straighten out, including whether it would be fair to the team that wins the Monday night game to require it to play a divisional-round game on a short work week. And Goodell said he doesn’t expect the NFL to have all the issues sorted out in time to expand the playoffs for the 2014 season.“I would be surprised if it happens this year. I think if it happened it probably wouldn’t happen before ’15,” Goodell said."
Additional teams means additional games and additional games means additional TV spots which could create some broadcast issues. Of course, it also means additional revenue which is why the NFL is looking at potential playoff expansion in the first place.