I honestly don't think Smart is in the future picture anymore.
Danny and Brad obviously shift to SIZE type of play.
Irving is the exception because he's just the best handler in the planet and a proven scorer.
Other than that, the team will be 6'7 to 7ft switchable big that can run the floor defend perimeter shoot 3s and can post in the paint or make layups. That's the recipe to win a title nowadays.
Smart is just not good enough in offense.
If Danny takes a small combo/guard, it will be for bench scoring or very small ball transition oriented BB (like what Spurs have with Mills e.g.)
Unless it's below 10mil a year, I think Smart is gone. Same as Rozier after next season probably.