Unfortunately I think we are not going to get much more out of Patrick. If he comes back I think he worries too much and his career suffers
If Crosby can spend 3 years getting over concussions and come back and be one of the best in the game again, I think Patrick can come back from a couple months off dealing with migraines.
I'm not really worried about him long term (aside from the lost year of development). I'm losing faith he plays much this year, but I think they get it figured out eventually.