OT:

What happens when DAZ moves on to Gen 9 — which it inevitably will

I have custom chars that I originally built in Vicky and Mike 4 whose shapes and characteristics are now on Genesis 8 figures. It's actually fairly easy to transfer the characters with the built-in tools (and thanks to Blacksmith3D, I recently brought their skins up to snuff, converted to iRay, then used a similar character's skin on each for SSS and other goodies.)

I even pulled this off recently with a Victoria 3 skin (Momiji from Momcat.)