I think you guys are over complicating things surrounding the issue of content. I don't mean to rub anyone the wrong way but in my eyes the content issue is much simpler. 

In 2011 Genesis was introduced creating a rift as a disruptive innovation at a time Poser was mainly in a circle of smaller incremental updates from Poser 9 onwards for several years. REF: https://en.wikipedia.org/wiki/Poser_(software) (Have a look here at the developments after Poser Pro 2010, things seem to slow to an evolutionary pace)((+ Someone needs to update the Poser wiki page as it stops at 11.2)) So basically it was revolution vs evolution which always generally goes one way in a marketing environ. 

This created a fork in the user base as many were interested in Genesis and some were directly opposed. Many users decided to peak there head over the fence and liked what they found there. A platform focused more on delivering a stream of user focused content or as some may term it "selling make art buttons". At this point the market began to radically alter and sales of Poser products started to drop in the market. Many Poser users embraced the core of Poser as a self creation program and begged for tools to aid in that end. Vendors seen the change in sales numbers of content and generally migrated to vending for both platforms as this was a viable option initially. Over time the returns on one side just didn't justify overcoming the hurdles of the different direction of both platforms. So Poser content support seen a slow decline by third party creators as a response. I also believe from maybe Poser 8 or 9 onwards the market began transitioning from mainly a community driven 'make and share freely' content experience to a more commercially based concept. These factors over a decade led to the current content situation. The broader digital art market is now facing a few new forms of potentially disruptive technologies such as AI image generation, but that's another subject entirely.

I'm not going to go into my ideas how of how I think it's best to correct the trend as that tends to be pretty divisive subject. But I do see some indicators that things may be heading in a positive direction with Poser and Renderosity definitely has both the Poser community and the future of the platform in their foremost priorities. I'm looking forward to future announcement of the direction of Poser 14 from Bondware.