Smart may be the future but that future is a long ways away. If you think Smart just went toe to toe with Wall and like just came up short or something you are completely wrong. Wall just played in two full games back to back and the 2nd one was double OT and he still got the best of Smart. Smart had far fresher legs and was having a good game.
Smart cannot pass or run an offense like Rondo, and for all his athleticism he can't rebound like him either, and he isn't all that good a shooter.
Smart isn't going to surpass Rondo by the end of the year or something.
We are lucky to have Smart as opposed to Noah Vonleh or possibly even Dante Exum, but Smart has a long ways to go.