I would be more open to updating my V4 to the latest Victoria IF there was an easy way to convert current items to be compatible with that figure,(key word there is "easy"). I'm not a modeler, and even after all this time, I am not familiar with the terminology used in some of the porcesses, so trying to figure out how to learn to create my own content has not been that successful.  I did try working with DaZ - too different from Poser and couldn't figure out the UI. I guess if I had started with DaZ instead, the roles might be reversed - don't know. Tried using DSON - failed miserably and nothing worked right. Tried Dawn - did not like that character's overall design. Did some stuff with the Poser 6 default character, but that didn't last long when I found V4. Just all the way around, V4 is a solid character design. Skin tones, movement. morphs, weight mapping, etc just make her better, and skin textures have improved greatly over the years. Also, her look, using the Superfly render engine looks on par with most of the current characters out there.
Been using Vicky for over 10 years now, and I still have so much more to learn. She's been a great teacher.
I would love to use some of the newer content/figures, and it's a shame that the older content can't effectively, (from my own limited research/knowledge), be used with the newer figures. Backward compatibility would make the prospect of upgrading to a more current version of Vicky much more appealing to me. 
All the same tho, why should I move on from V4, when I can get results like this?