I'd be happy with P5 support at this point. I cannot believe that the new Millennium Preschoolers don't have P5 MATs. P4 MATs but not P5? When P6 was about to be released? Mutter, grumble.

Don't expect the users to drop it any time soon. What, do you expect us to stop arguing about Mac vs. PC vs. Linux, too? ;-)

Sixus1 admitted that the lack of buttocks was one step backward to go a step forward. Which suggests to me that maybe the advances in Poser rigging aren't quite there yet, but will be in the future.

He also said that they chose to eliminate the buttocks because it made posing easier, especially with IK, and it made making conforming clothing for the figures easier.

Not sure this "one step backwards" was a good idea. It's easier for animators and easier for clothing makers, but there's no benefit for the vast majority of Poser users, who neither animate nor make clothing. :-/