That is two years away, but I would think that Pearl's system is flexible enough to allow a Selby and another great pg/wg on the floor at the same time without any problem.
If we had two guys that were both pure point guards, then I could see one of them sitting - maybe. But otherwise, you try to get the best ones out there playing.
I just don't think many teams with true top 25 players are going to have them sitting on the bench. I hope he keeps developing and stays in that group.