I see no reason not to use any figure available, from Poser 2 on up. I'm like Cimarron or meatSim; rather than convert conforming content, I just use the figure it was made for. If there's a specific type of face or body I want to use, I'll pick whatever works best, whether that be Dawn, Sydney, V4, V5, V6, MyMichelle, Angela, etc, etc. These days, expressions have become the most important aspect of a figure for me, so once I've decided the expression I want, I'll test various figures to see which gives me the closest approximation to what's in my mind. Frequently, that means niche and rarely used figures will be the best for a particular use! But when it comes to content, among them all -- and the males, as well -- I have so much content now that I won't live long enough to use it all.

If the question here is whether -- as a vendor -- you should "leave V4" -- that's entirely up to each individual. Lots already have, from the looks of it.

It would be a shame, though, if a lot of V4 content disappeared from the market altogether, since some of it is truly, truly top notch, even stuff that was made a decade ago. Smith Micro might do well to consider offering really good terms at Content Paradise for vendors whose generation 3 and 4 Daz items aren't selling (or even being accepted) at other venues -- if for no other reason than to keep it available. A lot of very hard work went into all this content, and as long as you can still load a figure with traditional rigging into some kind of software to render it, it is perfectly usable.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.