Well if we're being honest, the people dissatisfied with these games are just a loud minority. I'm pretty sure most people playing these games are relatively happy with how they are, as destroyerofassholes alluded to, thus people aren't really motivated to create their own take on the genre. Frankly speaking, I also just think the main audience for Fenoxo games are a bunch of people who don't really care much about compelling story-telling and mostly just care about sex scenes, so odds are they're not gonna bother trying to make anything new either. Just seems like there isn't a super high demand for this genre outside of what already exists.
It's a real shame, too. The format of these games can make for some interesting stories and character dynamics if enough care and foresight was put into it, but it seems like the devs care more for slowly trickling content into the game than introducing new and fun ideas. They could be doing anything but always fall back to the same old tired tropes.
If a competitor sprung up I'd definitely jump at the chance to write for them; porn games need more gentle femdom and tomboy supremacy, after all. Seriously though, would be fucking amazing if there was an alternative of these games without all the furry stuff and "everything exists to fuck" tone. The latter completely destroys any investment in the game.