It doesnt matter whether the figure started out as a cube or a basic human shape. The geometry has to be rebuilt once the sculpting is finalized anyway. Very few modelers still poly model a whole human from scratch. It's a huge waste of time and doesn't allow for the same level of control that sculpting and retopologizing allows.  A basic human shape can be pulled out of z-spheres in about 30 seconds and remeshed to a sculptable mesh in another 30 seconds, so why bother poly modeling by hand? You can still ride a horse and buggy to work if that's what makes you happy but it's not very productive and definitely not as fast as a car. These days poly modeling is mostly used for hard surfaces or very low poly meshes that don't have a lot of geometric detail, or for producing basic shapes quickly.  And any figure can be retopologized to suit whatever app it needs to function in. Outside of Poser and DS, most human models don't have the complex geometry that Poser models require in order to allow for all the morphing and still be animatable, but that doesn't mean any other model out there can't be made to have the same kind of topology if the person building it (or retopologizing it) understands proper topology for animation to begin with.  

Vicky is a nice figure, but she's not the best. She's just the most popular in poserdom because no one has bothered to create one for Poser that was better. There are others out there that are much more realistic, and could easily be made to work in poser with all the functionality - and then some - that all the vickys have ever had, should the artist choose to do so or allow someone else to. 

As for the talk about SM and their stock, we really don't need two threads about it. One is more than enough. Maybe SM will take the opportunity to finally wake up and realize they need to invest in a serious content department to compete with their competition. But something tells me they'll just continue ignoring that elephant in the room.