It's a particularly brutal time for an injury like that. I think what people are trying to say is, if your son hadn't already gotten much D1 college interest, and now he is injured and no-one knows what he'll be like when he comes back, when he's missed 2 or 3 years of baseball, and given all of the covid craziness in college baseball and the surplus of players at all levels, and no-one knows right now how that is all going to play out . . . no-one can really answer your question even based on past experience about this kind of thing. That's why people are telling you not to over-think it now. I get it, I always over-think everything. Trying to plan in a situation of maximum uncertainty is hard.
Anyway, you also got a lot of good practical advice; PTWood said it early on:
@YachtRocker my son is at a school that has a post grad program. They are placing some players but no matter how you cut it, it's an expensive way to buy time and doesn't always translate into better outcomes (some still didn't get offers, some are going to JUCO or CCs and I don't know what kind of money they are getting when they go D3-D1).