I understand the seemingly dumb goal of paying to go to college simply to have a Senior Season. We have all seen Seniors get injured or lose a position battle so there is risk of things not working out at a significant cost.
Unfortunately I know of a couple of 2016 HS Grads that have traveled strange journeys:
One-Went to a top rated DI JUCO. Red Shirted his Freshman year. Pitched thirteen innings his next year. Transferred to a low DI college in the lower RBI rankings. Ticked off a coach an pitched one inning as a Sophomore. Technically has two years of eligibility and is still looking to play but track record probably scares coaches off. Player throws 92ish but has zero command. The parent is willing to foot the bill.
Two-went to a DIII JUCO. Freshman year got hurt and red shirted. Second year played well but the school was a weak school and the coach probably had little track record of getting players connected. He was going to a DII JUCO and playing well. The school has a track record of moving players to DI's so he may have gotten some good looks if the season had continued. He is a hitter first position second player that probably can hit at DI but may be troubled to find a position. JUCO cost are low but clearly the motives are to play baseball. His father had no clue how the recruiting process worked in High School and Travel ball. Then they jumped at the first JUCO with no understanding of the competitive levels or how tough it is to get recruited out of a JUCO. I encouraged him to play in the local Summer College Summer league for exposure and he had no idea it existed. Just a real bad approach being recruited.
From what I've seen of my son's former coaches they had successful Red Shirt Seniors that graduated and moved on rather than delay graduation or attend as Grad students. My guess is if the coaches feel they recruited strongly they will move most Seniors out to clear a path for younger players. The Seniors will have the opportunity to find other schools that have positional needs based on their track record. I'm sure it will be hectic for all involved but it is not that much different than being recruited out of High School except the player has a validated track record. I guess there could be challenges with applying to Grad Schools but I'm sure schools are going to bend a little if they have slots for students. I feel bad for the players but nothing is guaranteed. At least they have the opportunity to work a solution .