It's difficult, because White's injuries really come down to nothing but rotten luck. It's not a matter of him having degenerative tendons or ligaments that plague many an athlete before him. All three of his season ending injuries have been bone fractures, which is really unheard of. I don't think I can remember any NFL player having such dreadful luck in regards to health.
The silver lining from it though is that these kind of injuries are recoverable and don't hinder athletic ability, unlike ligament tears. It'll come down to White working his tail off and showing the ridiculous athleticism that made him such a desirable prospect.
It's also do or die for him. This year is his last shot. If he doesn't make it, his career is likely over.
If he can get on the field and stay, he has the insane combination of speed and size to kill. But being off the field for so long, one has to wonder if his receiving skills have deteriorated.
I'd say don't get your hopes up, but keep him in the back of your mind.