I would rather Miller, but don't look lile it will happen. These are the reasons why he should have a shot.
Miller may be our long term starting SF, so why not give him starter minutes and let him grow? Dude has the talent to be a decent starter, sorta like Shane Battier or someone(IHDK). He has range, can knock down the jumper, he proved he can hit the 3 and he shows flashes as a good defender. He is one of those NBA players that do everything decent, not dominant in one area but a good all-around player. So continue to give Miller a shot with the increase os minutes and the starter position atleast for some time so he can show what he can do.