I think the concept that there are "many others" is an assumption with no proof. Perhaps there are. Perhaps there aren't.
If there are, you are correct, it could kill the "Golden Goose".
Two3 and I are old enough to remember the age of the four-year All-American and we pine for those days. I suspect that fans not old enough to know anything other than one-and-dones and mass migration are likely not as disturbed by it as I am.
Regardless, for as long as it lasts, sharing the economic benefits with those who produce the bulk of the economic value is still the right thing to do.