I think V4 has a lot of potential. If I were DAZ, I'd leave the mesh and the morphs as they are and concentrate on improving the rigging. As a Poser user I'm very sad to say this, but I'd probably also create my own rigging system within D|S and distribute a Poser-8-compatible version as a separate figure. I would definitely not support pre-8-Poser for the next generation of figures.

-- I'm not mad at you, just Westphalian.