He is looking like a Lewis/Buxton type of player. Tons of talent but even if he makes it to the big leagues that does not mean he will actually be on the field.
Both thumbs with injuries will be tough to not be a different hitter.
If my memory is correct he has to be added to the 40 man roster this winter or risk losing him to waivers. I would not give up on him just yet. He is still young.