As some have pointed out I think people use Poser mostly because of content rather than for the program itself. I myself never do any render in Poser, I use it for content and to do the posing, then export everything to my program of choice, Vue. I suspect many people do that with all kind of other 3D programs. I'm not sure exactly what your aim is with FAST, but it needs to be clear. Are you hoping to replace poser as a content and posing program, if so will it support all the legacy content? Will it use its own new content type? Are you working on building a full featured rendering engine for it, and if so will it support all the bells and whistles like Global Illumination, Radiosity, etc? Personally I predict that if Poser does go away, the big benefactors will be the other 3D programs as people move on to those, and most people will still use Poser or move to D|S simply for the content / posing elements, but I wish you luck as there is room for a brand new, high performance and fully featured 3D posing and animation software.