That’s correct. Renpy is so powerful that you can use it for just about anything, but I don’t see any new significant games for it. Unity also made a showing recently, especially with their Adventure Builder.
The thing is that game companies built custom engines for their games. So much that basically it’s no more difficult to just get Unity 3D and build the system from scratch. But that’s expensive and something hobbyists don’t do.
I’m not aware the situation over in Japan, where VN are really popular. Presumably, they publish more VN than ever over there. I think Tyrano Builder is popular over there?