I am saddened to hear about any kid who gets injured, especially with an injury like a labral tear.
Unfortunately your son sustained a significant injury that does not always come back to 100%. I've spoken to several knowledgeable surgeons that say labrum tears are much worse than rotator cuff tears. That is especially true from a return to top level sports such as tennis and baseball.
So it is not a surprise that schools that were once interested in him are now waiting to see how he recovers.
I like the suggestions Prepster gave you, and think your son needs to fully focus on his recovery and not rush to try and get back on schools radars prematurely. There would be nothing worse than he and/or you pushing to get back too soon and then have a setback, which might be permanent. He needs to be healthy first, so worrying will not make it go any faster, but might raise the anxiety to the point that he considers rushing back.
Good luck and let us know how things are coming along for him.