There's only one thing I'm sure of: people are lousy at making predictions.  Whatever you think the future will be like is probably wrong.  And experts are likely to be wronger than most. 

Maybe DSON will actually become decent, and Poser users will flood into Genesis en masse.  Maybe DAZ will change their minds and make Victoria 6 or 7 a figure that works natively in Poser.  Stranger things have happened.  Maybe the DS and Poser markets will part ways, and DS users will no longer bother to come here to the Poser forum and Poser users will no longer visit DAZ.  If that happens, who will be the new queen?  V4 may reign longer than many think.  As long as there's money to be made, DAZ will keep her available.  Or maybe they'd even sell the gen 4 figures to SM or a third party.  Poser users might get behind an entirely new figure, once Vicky is not sucking all the oxygen out of the room.  Or Poser might become a more fragmented market, with many different figures (I could see utilities like WW and the magic of shaders making that far easier than it used to be). 

I'm not going to make purchases based on what I hope will happen in the future.   For all I know, DSON will end up like Bryce and Hexagon - DAZ's redheaded stepchildren.  IME, if you wait for DAZ to fix something, quite often the only thing you get is older.