I don't think he'll reach superstardom, but I won't discount it either. His impact defensively is legit, and if he can establish himself as a pick and roll player with a 3-ball he can become very dangerous.
He needs to begin driving more though and get to the line, that's the key to being a superstar.
Agreed. There is a massive gulf between being an NBA superstar and a solid starter.
There's a space in between there, though (cue Dave Matthews), where on the right team you can be a really important nightly contributor and have huge value despite not being a two-way star.
Again, I want to point out the numbers I quoted earlier:
15 points, 5 rebounds, 5 assists, 2 steals, ~42/35/70 shooting.
The list of guys who have done that at the guard position is filled with very, very valuable players. I think Smart can reach those numbers if he continues to improve at a reasonable rate and plays starter minutes. Maybe not this year, but within the next couple of years. And since he doesn't rely overmuch on athleticism, he could do it for a long while.