I wouldn’t mind Tom dropping back home, its likely he’ll be able to go seeing as how The Abyss is built like New York City so therefore there still must be a connection to it. However, Tom’s world is Astlan now, if he went back it’d only be I’d imagine to say bye to his mother.
Actually I wonder if Demons would be trapped and what would happen if they went to earth. From what I gather, earth is an extremely low in mana, perhaps non-existant realm, making magic nearly impossible as well as making it difficult for any ‘magical’ species to survive there. Since Tom no longer has a physical body, only a magical construct of a sort, I imagine it wouldn’t survive long on earth… or perhaps he’d be trapped there unless he had enough energy to cross back.