It would, but it just wasn't built in from the start.  That's just kind of necessary for morphing.   It's not just a polycount issue, but a topology one.  Even if you subdivide her, I'm not sure you're going to have the polys for making proper ribs, let alone the small muscles on the ribs.

I know worrying about polycount is popular these days, but I find that kind of ludicrous considering how many people want eye textures that are over 2000 x 2000, a size I've literally never seen eyes actually rendered at.  Textures have to be uncompressed to render.  I never, not even on my previous and quite old box, was unable to render a scene due to polycount.  But I still have Poser tell me it's run out of resources for textures, and I now have more RAM than I know what to do with.  

This is basically a limitation to Antonia that can't be gotten around without signifcant complications that will put her usability right back where it was before the revamp.  But I think that's OK, really.  How much artwork is made with extremely muscular or defined women?  Very little, from what I've seen in everything from sculpture to charcoal to line art to oils to 2d and 3d artwork.  As it is, Antonia can do tons of different looks, just not ones that are extremely defined in the body.  I've actually found her face easier to give detail to than V4's.  

I love diversity, but I don't need every figure to be everything for me.  In fact, that's been my problem with the dominance of the Vicky figures.  What they do well, they do well, but what they don't, they really suck at.  I don't need Antonia to be absolutely everything.  I just need her to be excellent at the things that other figures are not.   I'm still looking forward to new figures with an equal amount of realism that have different features.    All I wish is that there was a single UV mapping and region naming convention.  Between that and dynamic clothes it would be relatively trivial to switch to new figures.