Imagining Emma in a princess dress being introduced as Snow&Charming daughter is one of the funniest pictures I have in my head. She’d look gorgeous, of course, but totally out of place. 
I think the main question there is to figure something out and answer this question is whether FTL still exists untouched (and empty) or if it somehow was destroyed (watching the Pilot it seems possible). For my part, I believe it’s still there and at some point people will return, but I doubt that everyone will. I could well imagine that some, like Red/Ruby, would like the world of SB better. No transforming so far for her, though who knows if it will stay like that.
Whether or when this happens’ written in the stars … or on a timeline only available to the writers. 😉