Never what the fans want? Just like I said...greedy. They have always tried to keep the setlists balanced between what they want and what fans want. You ppl keep asking for things they don't want to play, like old stuff. They have played some songs for 9 years, and ou don't think that they don't get tired of playing the same things? These arn't the same teenagers who liked to jump around the stage. They are grown men with families that want to play songs they like to play.
And for new material...YOU ALREADY GOT NEW MATERIAL!!!
EDIT: and I almost forgot, Chester's voice is still not in "as good" shape as in 2004. There are songs, like By Myself, that wear down his stamina.