Here's the thing. DAZ isn't shooting itself in the foot.  Let's say that Poser decides NOT to adopt the Genesis technology. DAZ will continue to sell Genesis to it's own Studio users plus Carrara and Bryce users. Genesis just simply not be on a par with V4, which by the way will still work in DS4 and Poser.

I'm not going to lose any sleep one way or the other because I'll probably continue to use Poser regardless.

As for vendors I've said it before, they'll go where the money is, which means that they'll probably stay with V4 until they see evidence of a surge in Genesis' popularity.