If one class of athletes gets an extra year to play, another class loses a year.

In baseball each school only gets 11.x schollies at one time and a class stays another year, then the high school seniors do not get any scholarship help at all. If NCAA lets the number of schollies go up for one year, probably only the better funded schools can afford the extra athletes. AND if you have more athletes, the more experienced players are likely to fill the spots and the new kids lose an opportunity to fill in behind the older guys who in normal circumstances would have moved on.

The same sort of logic exists in every sport that plays in the spring. If Covid-19 comes back in the fall, then the one more year logic difficulties impact football and basketball.

So someone wins and someone loses which ever way you go.