Sure, they could come back but it’s worth noting that it’s not really up to them. The writers have to find a way to reintroduce them into the storyline in a way that doesn’t feel fanservice-y and lines up coherently with the narrative. Right now, it wouldn’t make any sense for anyone from SB to come into HH since, according to Regina, they can’t get in touch with SB or go to them for whatever still unexplained reason.
Rumple dying and meeting Belle in the afterlife makes a ton of sense so that’s why Emilie making another reappearance is at a higher percentage than Snowing, both of whom are alive and in SB without any knowledge of what’s going on in HH.
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"He was a lot of things to me" "The only conclusion was love"