People need compelling reasons to upgrade or they won't; Genesis is compelling enough for people to want to upgrade if they want to use the new Genesis figures.  I upgraded to Windows 7 because I hated Vista and it was not full of bugs and worked fine out of the box with very few issues.  Miscrosoft addressed the issues people  had with Vista and fixed them.  I think the bottom line is that if people see an upgrade as being only slightly incremental they might be more willing to skip one.   Poser's upgrade is less compelling, but the SSS, library,  and Open GL improvements were enough to sell me.