Hmm. Interesting reasoning TG.

The last reason has to be the deal closer, i.e. it has to be bigger than the rendering enhancements and it has to appeal to everyone, not just animators, to avoid the situation you describe. I guess it could actually be several reasons lumped into the last release to really make an impact.

Content management is a no brainer, but this can't be the main reason, because this is more useful for CP. If they don't make installing and managing extra content easier they hurt their own profits.

Modelling tools inside Poser would just annoy everyone. They want you to use Shade anyway. (I prefer Silo.)

Rigging is the single most common user complaint as far as I am aware.

Your wobbly body dynamic sounds good. How would that work? Would each material get a wibble value with blend zones in between? Would that improve joint bending?
I guess the easier implementation would be a wibble map, like a bump map. Black means rock hard and white means very wobbly.

The easiest thing to implement would be to make dynamic cloth easy to use.

I am really curious.