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What would Non-DAZ figure need to become poserdom mainstream?

Couple o' things... but let's tackle your questions first:

Quote - Come with Poser?

Yes. Not because of any kind of imprimatur, but because of distribution. Posette ('member her?) was the most supported character pre-Vicky because of this, and lasted a long time - not fading out until Vicky 3 showed up.

Quote - Be heavily promotoed by SM?

They should promote the figure - at least as hard as they promote the software.

 

The other things they need to do/have?

The figure has to be more than merely a placeholder...

• It has to be highly flexible in both limb and morphability - the latter being highly important. The reason existing default Poser figures fail is because you cannot get rid of the current look without the results looking amateurish at best, and like botched plastic surgery at worst. The mesh will have to be built so that morphing doesn't introduce too many bad artifacts such as breakage, folding, or 'chunking' (where you end up with sharp angles on curves that only SubD can fix). 

• It should have a solid texture map, but it should have a fairly easy means for users to re-texture it.

• It has to come with a large set of basic clothing - not just the perfunctory stuff, but a variety. That clothing should come mapped so that it can be re-textured w/o having to buy a pricey app to do it. 

• If it's going to have naughty bits, make them accurate. Otherwise don't bother. 

• It cannot be too complex to operate, with a bajillion bones/joints. OTOH, something with an actual spine/trunk that bends smoothly (I'd almost say 'easy-pose' like) as opposed to bending in chunks would be a huge benefit. The human spine has dozens of of little bendy spots in it - not three.

 

Personally, I'd be all in favor of casting aside the current joint system, and bone/rig the thing like the big apps do.