If he can continue to consistently hit that three and dish out those assists, he'll stick. Hopefully not having to be 'the guy' in the NBA will free him up to do those things.
And thinking about it, yes, he's short, but he's not that far out of the range of normal. It's not like he's Muggsy Bogues or Spud Webb or anything; he's not even Nate Robinson. One thing all those guys had in common was crazy athleticism. And Boat has that in spades too.