I'll be disappointed if that is the case, but if Toby is really going with 'chapters', I think it's pretty likely that the Card Kingdom (or whatever it's called) is just a dream world, and everything has gone back to being mundane items in the real world. Ralsei will surely be back, and maybe we'll see his little kingdom expand (all those empty houses and shops).>>438375068
Well, we do know that monsters age strangely. Maybe it's only been a few decades, and while most monsters have had children and subsequently died, only a handful like Toriel and Asgore haven't. That kinda works, but I think it's more likely that Toby didn't think about it that hard.