IMHO poser should be redone, but not all at once too many ppl will see the change and say "It's too different. Why can't they leave well enough alone. P4 was good enough for me. I don't want to learn all this new stuff." 

They should do it in increments starting with the material room(see what bb said), then the pose room (lights, cameras etc) then the hair room(more control over styling strands), the face room(no one seems to be able to use it), the setup room (how I couldn't tell you. I don't use it but other ppls comments seem to imply it's more difficult than it needs to be I could be wrong though). Each time updating the render engine as needed. Finally over hauling the render engine because I would imaging all this incremental updating would make it a mess.

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