I work in HS athletics, our FB team has a scrimmage week before regular season. Sometimes its vs 3 other teams, sometimes its against 1 other team. The teams scrimmaging agree on rules, maybe if 4 teams, you scrimmage from 40 yd line going in. Either score or stopped on downs, either way move ball back to 40. Off. runs 20 plays, then other team runs 20 plays. Switch opponent, start over.
Maybe if 2 teams, you do situational stuff like goal line off. from 10 yd line, or whatever you want, then you actually play half a game.
Now lets imagine the NCAA would agree to let teams have a 4 way or 1 team vs another. Michigan, Texas, USC, LSU in the Big House in April. The teams agree on what ever rules they want. Instead of 15,000 fans, its a sell out. Maybe Bama, Florida St., Ohio St., & Oregon. Maybe M plays other B1G teams not on upcoming schedule, of course always a chance you would meet in B1G champ. game. Don't schedule cup cakes, its a scrimmage.
If NCAA, DB & other ADs could figure a way it would make money, bet it would be approved.
ESPN, ABC, CBS would love it. I'm sure games could be scheduled so not going against final four or The Masters.
I know injuries a possibility, but injuries happen in intra squad games as well.
Question, would you pay to see a scrimmage against top competition? $50? More? Less?