Come on. This is a great scenario for a sequel and an epic adventure.
Vlaakith, Zariel, and the rest, epic battles, and epic rewards and situations. Traveling between planes, the Wish spell that all the fans have been talking about and stuff like that.
Continued romances and character development.
I'm assuming a canonical version of the ending of BG 3 is needed for this to be possible, with a few minor cosmetic changes. But I think the players would be sympathetic to this.
