As a huge Brad Miller booster over the years, I first find myself grimacing at comments like these. But it's really really hard to disagree, even as a B-52 fanboy. From The Bee's Marty McNeal:

How many games would the Kings have won with even average rebounding and defense from the center position? Miller finished 55th in rebound rate among the 78 NBA centers who played 500 minutes. (For comparison's sake: If Justin Williams would've kept up his pace and played 500 minutes, he would have finished tied for 5th.)Miller was brought in to be tough inside (which he was in Charlotte, Chicago, and Indiana) and to add to the overall skill level on the frontline. During his first two seasons here (03-04 and 04-05), he excelled at both counts. His third season, he became a finesse player. Now? He's honestly a parody of himself — the occasional backdoor pass, an infrequent money 18-footer. But it's a joke, a mirage. He can't be that player anymore.

So there are two options: reinvent yourself (unlikely, given Miller's noted disinterest in working out in the summer) or go away. There will be a buyer at some point — Chris Webber was practically an amputee when he got dealt. But the return package will not be pretty.