If she, Neal and baby Henry were happily living free in Tallahassee, then the inhabitants of SB were stuck and Emma wouldn’t have discovered who she really is or found her parents.
Oh, and why couldn’t Neal just stay with them and bring Emma to SB himself? Obiviously he believed August so why did have to just leave rather than work with August on trying to convince Emma to believe?
Also, I don’t believe in destiny. That would mean we have no control over our actions and therefore no real free will.