I think there is pretty much no chance they are going to show any other afterlife realms after this season. Whatever happens with all that happens, and whomever is dead will be dead.
This.
As for everyone except Rumple, Henry, Violet, Belle, Regina and Emma seemingly getting sucked through the portal, cue *eye roll.*
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy