Someone said that might be where the NFL actually steps in. The one and done NBA rule wasn't a college rule, it was an NBA rule, to protect themselves from taking high upside busts straight out of HS. That the NFL has largely sat by while NCAAF served as a free developmental league. But apparently, particularly on the lines, they are concerned about the lack of development now.
I'm not sure what the NFL can do, because the issue isn't guys trying to enter too soon, it's guys not developing. Their trust exemption gives them some latitude, so I wonder if they do something like say you must have been rostered for 2 consecutive years at the same place to be eligible. I'm sure it would be challenged, but again, CBAs and anti-trust exemptions can help
