I really haven't read through this thread. I'm only a very basic coder and have no real interest in learning more. But I do have one question/comment.
Right now, literally anyone can open their own Mux and run a game. Some basic commands that are out there, build a grid, done. Cgen has always been the biggest hurdle but I once played on a game where character sheets were posted to a webpage and weren't on the game. They could also be put into a basic ¬e of some sort if you wanted. Or you could borrow someone's existing cgen and tweak it to fit your system. You didn't have to be a great coder. It didn't have to be efficient or elegant. It just had to work. But the point is, you could make a game for any genre you wanted.
With Evennia, it sound like you need to be a semi-professional programmer/game developer to make a game. And if that's the case, the hobby dies because it's built on amateur hobbyists enthusing about their favorite genre/game system/book.
So is this the case or can any GoT fanboy decide to take Evennia, install it, (and for the sake of argument borrow an existing cgen) and open a game within a a couple months?