Miller would really upgrade the team. Passing, defense, size, experience with Adelman. It's a picture-perfect move to shore up the backup center position, which is really critical with Yao's injury history. They'd be deep at every position. Miller's old, but this would allow Hill to grow into that role, if they keep him.
Still he would be a suitable backup in our current situation. That way if Yao went down, he could step in and start and have Hill back him up. Sorry, i just have this feeling that Yao should not come back til after the All-Star break. The more time the better. IMO.