Miller should be a PF, we should get a true center who can play defense and dominate on the glass. SAR or Peja should be at SF (or Bonzi at SF, Peja at SG). Brad still gives us scoring, passing and rebounds at PF, and the new C makes up the deficit.
Problem is, those centers don't really exist. And the ones that do are completely out of our league. O'Neal (Jermaine and Shaq), Camby, Yao, Wallace...and then who? Bogut, Bosh, Frye, Chandler- all the young up and coming guys. What do these guys have in common? The Kings have no chance of getting them.
Take a look at the guys who average more rebounds than Miller at C. Miller averages 13.4 pts and 6.1 assists. Camby, JO, Shaq, Bosh, Yao and Okur average more points. JO and Bosh are the only guys close to Brad in assists- at 2.5. Passing is good. So there are 5 or 6 who can come close to bringing the whole package that Brad has. Granted, it's mostly on the offensive side of the ball, but at a certain point you have to be realistic.
Brad is ONE PART of the problem. There are 13 parts to this problem. Someone has to go, and if it is Brad, so be it. But each player (and the coach) brings their own set of pluses and minuses. If I were GM, I would listen to any offer for any player and go for whatever nets me the most talent. Singling out players to keep or to trade is stupid and really (if you were GM) would make putting together a great team that much harder.