First, fundamentally, no one is "forced" to play college football. It always has been a voluntary activity and still is.
Second, college football used to play 8-game seasons. In 1945 it went to nine games. And until the mid-1960s, football was a single platoon game. Most players played the whole game, not just half of it. So, in reality, compared to today's two-platoon system, players who played an 8-game season were on the field for the equivalent of 16 games. And today's players are on the field for the equivalent of only 6 games--half of twelve games, for those who were absent for arithmetic class that day.
And the regular season has continued to expand until we now have a 12-game regular season, and then some teams play in a conference championship game (13th game), a bowl game (14th) and two play in a national title game (15).
So college football seasons now are nearly
double what they used to be. Yet, I haven't heard many complaints about the demands put on the players by not only extended schedules but by year-around training.
In reality, there is no good reason teams can't play an 8- or 9-game
spring season and an 8- or 9-game fall season in 2021. Then you're back to "normal" for the fall of 2022.
And the players who don't want to play in the spring, for whatever reason, no problem. Next man in. IMHO.