I recently just read some random theory on reddit about how Kirby might stay on wherever Forgotten land takes place, one of its points was that Waddle dee town looked to be some form of permanent settlement. Until the game comes out and I proceed to watch everything about it including cutscenes because I can't play it myself, I suppose this theory may be plausible, all until Kirby return to popstar or something comes out.
(That actually sounds like a cool game concept, Maybe I'll make something from it)