You should probably contact Larian's writers and let them know how easy their job is, heh. I'm not saying it's impossible, I'm just suggesting you might be reading what you want to be there into the ending. Certainly, if Larian was working on releasing an actual DLC any time in the near future, I'd have expected them to at least mention that something like that was in the works. Lots of stories end with some version of "and their adventures continued" after all, and it's a perfectly fine way to end a D&D game. But hey, I'm not trying to pick a fight here or anything, if it turns out I'm wrong, I'll happily eat crow and go off to enjoy future adventures in Avernus.
