Yeah the backcourt is least of my worries right now. I'll take any upgrade to the roster we can get if it is a reasonable price, but this is definitely far from a priority. We have Thomas/Bradley/Smart locked up for 3-4 years at ~18 million total. Thomas + Smart + ball movement based offense is enough "PG play." We don't need a pure point guard, and Smart will likely develop into a fine PG so there is nothing obvious about this as others have said.
As a side, if I hear another Smart and Tony Allen comparison I'm going to scream. Their similarities start and end on the defensive side of the floor. Their offensive games couldn't be any more different. One is an erractic, out of control offensive player with no jumpshot (like completely broken) and no playmaking ability at all and a high dribble. The other plays much lower to the ground, has a tighter handle, has shown an ability to run actual offensive sets, and is a much better 3PT shooter as a rookie. He's generally in much more control on the offensive end. He struggles in the pick and roll, but he can develop that. Again, they couldn't be anymore different offensively.