A lot of poser users modify their figures and content to suit their needs. Others use nude, morphed figures to paint over in photoshop. Most of the features that have been added to Poser over the last couple of versions have been geared towards the needs of content artists more than the end users. Making and modifying clothing in Poser has become easier with each new version. There are volumes of content that is already available for pre-genesis figures and various ways to export content from DS and modify it on your own to get it working in Poser. It's not rocket science. It doesn't take any special skills or degrees or secret recipes. DS still exports obj files, and those objs can be brought into Poser and used in the fitting room for which ever figure a user wants that piece of clothing to fit. For those that have zbrush, a piece of clothing can be sent directly from DS to zbrush, fit to a native Poser figure in zbrush, and then sent from zbrush into Poser to be rigged in the fitting room. That's just one example of how Poser artists can take advantage of genesis content without having native genesis support in Poser. And if you really need Genesis in Poser then there are a number of threads that show how to make Genesis become a native Poser figure with some elbow grease and determination.

So while the 3rd party content market for Poser may seem like it's fading out, there is no way for anyone to know how much of the new genesis content is still being used in Poser by the Poser DIY'ers - and for pretty much all of it's existence, Poser has been known for it's DIY crowd. A number of its features that are standard in Poser today came from that crowd tinkering and finding new ways of doing things. Even if Poser did adapt genesis natively, how much of the rest of Poser would they have to change? Materials would still be different because they now use two different rendering engines. Content vendors would still choose one platform to support over the other, just as they are doing now and have largely dropped DSON support, as it's been stated by several that it wasn't significant enough affect on their sales to continue including in their products. And from a logical standpoint, If the lack of native genesis support was directly affecting Poser's profitability to any significant degree, SM would have done something about it by now - either by adopting Genesis native support, or by investing in the development of a substantially similar figure. You can't site the current value of their stock as any indication of how well Poser is doing on the worldwide market since - for one, Poser is just one of several titles that SM owns, and 2, the competition you're comparing them to doesn't even have a stock value since it's a privately held company and doesn't release it's profit data to the public.