I'm using stable diffusion now.  Ken 1171 has created a plug-in that can export poses to something stable diffusion can use.

Is it a threat? Well, yeah.  This is what happens when the Poser userbase is reduced to those folks that make single image pin up art.

It is easier (and cheaper) to make pin up art in stable diffusion than it is in Poser (or that other program).

The (only) good news is that it is really difficult to do anything long form with SD.  The reality is that there is no "intelligence" in the AI.  Everything is being brute forced.

SD can't do what I do in Poser, so I don't see it as a threat - but if we are being honest since I don't do single still pin up art, I am no longer considered a "typical" Poser user.