While I don't think such as spinoff is likely, I think based on what we've seen that the rest of the characters in the Framework are probably people, not NPC - or at least all of the characters who interact with the main characters enough to exhibit complex human behavior, and that's a lot of characters.I think it would be hard to get an audience to care about a world with such low stakes. You'd have maybe a handful of main protagonists who could die, and then everyone else is basically just an NPC.