Let's see...

I use Poser 7 and Vue 6.5. I also have around 600 content files, many of them V4 related.

What would it take for me to use the latest Genesis figure? Well, buy a new Poser version ($70) or learn DAZ, something I don't have time or the desire to do. I only use Vue for scene creation and rendering, and it's not going to support the latest Poser version, that means upgrading ($1,295).

Past all the re-learning and large expense for the software, then I would start with no content for those figures. That would mean buying all new clothing for them, another large expense.

So no, I have no desire to move away from V4.