he'll get there. give him some time.
Maybe, maybe not. People said the same about Dukes and it never happened. Now, I don't know if Dukes is the best comparison, but he is a good example of what will happen if he doesn't start hitting breaking balls, curveballs in particular.
With that said, batting him in the #2 spot would be a disservice to Desmond at this point. Let him bat low in the order where they will throw him breaking pitches and where he may struggle for a while, but will get a lot more experience at seeing those pitches.