Well, nice to see everyone thinks this kids is just going to come up and become Lou Gehrig... just step into MVP level quality... Sorry to say, history shows that the odds are highly against him on that..
As far as him being called up anytime soon (even a Sept. callup), first, we need to lose someone from the 40 man roster to make room for him. Right now, the only person I can see that with is if we just cut Jorge, which I don't see happening. (The same issue to bring up Man Ban as well) Unless Martin or Cervelli go down for the season, I am not expecting any moves that would bring either of them eligible to be brought up.
I do expect to see Betances in Sept., but he is already on the 40 man roster making him eligible for the call-up without losing another name.