DS uses QT scripting for it's plugins as opposed to Python.  Maybe at some point SMS will add weight mapping and maybe they won't.  Poser has survived a long time using the rigging it currently has.  With the recent updates to joint encapsulation in P8, SMS may be in no hurry to make any more changes. 

So far, I haven't been all that impressed with Gensis.  The Autofit plugin is nothing more than a conversion app and not a very good one compared to WW and WW2. 

So far, DS4 and Genesis has been more hype than substance.  With the economy the way it is and the size of the Poser market even at it's best, DAZ is taking a huge risk splitting the market.  SMS isn't dependent upon Poser sales or content sales to survive.