Moon's idea is a good one but that is a great alternate idea ALP (and a more practical one).
College is the farm for NFL QBs. Through no fault of the college game it simply is not preparing/training QBs for the pro game. For example Tyrod, I watched Tech (go out with a girl who went to Tech - be forced to watch Tech games
) and what Tyrod was repeatedly doing at Tech was definitely not preparing him for the very difficult task of operating a pro passing game at a high level. He - through his own skill or simple luck -- got some pro seasoning sitting on the bench behind a decent pro QB. IMHO if Tyrod had been thrust into a starting pro spot quicker (like many are) he would probably be out of the NFL at this time.
The idea of giving teams latitude to keep a college QB newby or two under the wing for a few seasons without it being a tangible negative to the 53 roster is a great idea to keep the pro game where it needs to be(like it or not): a prolific passing one.
Side note: though this may seemingly be a minor item, one thing the pros can do to help is Roger and company can take some of the skim, give the NCAA a giant stack of it for "scholarships", and it ultimately is a quid pro quo to move the college hash marks to mimic the pros. Though a small change it may(?) force college coaches to spend more resources on getting their QBs to pass the ball (my assumption being coaches needing more passing to win games will mean greater repetition --> better accuracy and efficiency --> better prepared for the pros).