I don't think it's about talent.
There's a couple of things here.
Will he be welcomed back. Will he want to? To say its going to be mighty uncomfortable for him in the uber-conservative world of the PGA is an under statement.
Might he not reckon a new life and a new start elsewhere in the world where the baggage doesn't hang so heavy? If I were him (assuming I want to stay in golf) I'd be thinking in those sorts of terms
Welcomed back? That depends on him. If he completes rehab & stays clean thru the suspension, then he will likely come back with mixed reaction. Staying clean will get people on his side.
We love a comeback story. And if he still has the desire (there's the real question) & a strong enough constitution to put up with the catcalls that are sure to come from the gallery, then yes. He will most assuredly win again.
It's all up to him.