I think sitting out of playoff games, bowl games, and possibly moving into later portions third seasons could become more prevalent. There is a lot of discussion on message boards, recruiting sites, social media, among recruits, and even from coaches that the only reason to attend school "x" is to get a better chance of making the NFL.
If that really is the ONLY goal, then why would you keep playing past the point when you are guaranteed to be in the top rounds of the NFL draft? From some of the attitudes that I read on this forum, the players don't go to college for school, nor coaches, nor teammates, nor college experience. They are solely interested in having a shot at the NFL. If that is the goal, then which if more important, a national championship, or a large NFL contract? If half way through your junior year, you have the measurables and the resume then the ONLY thing that finishing your junior year could possibly do is give you an injury that takes that opportunity away.