The NCAA not only has insurance for this type of thing, but they have a massive rainy day fund. A couple years ago it was released how large it was and people were furious that the NCAA was holding onto that money instead of distributing it to schools. I don't remember how much it was, but it was enough to fund the NCAA for a multitude of years.
We'll see how things play out. It's no guarantee everyone would want to come back anyways. Banks being a prime example. He has a kid now so at some point he has to work towards becoming a provider. I don't know everyones situation, but being able to finish up a masters or have an extra year to develop might be useful to someone like Xeyrius or Cheese.