A Fan Theory by Gareth Hughes
If you haven't watched the sneak peeks for this Sunday's episode, stop reading now as my comments will contain spoilers.
In the sneak peeks, we assumed that Regina was going to use the last bit of magic she had to go on 'one last journey'. We assume it is her and Jefferson that is taking the journey but what if we are wrong. What if Regina is plotting to use the hat to send Emma on a one way trip.
Recent interviews have mentioned that Regina is scheming to exile Emma.. What if this is how she does it? By sending her to another world.
Maybe Regina will promise Jefferson a reunion with his daughter if he goes along with some dastardly plan to rid Storybrooke of Emma. Blinded by love and desperation, Jefferson may allow himself to once again be used by the Queen.
Also since the title of the finale is A Land Without Magic, and since Jefferson told Emma she had magic, could the title imply this ending as well. That the magic from Storybrooke would be removed if Emma was exiled.
We know these writers love to send characters on long and emotional journeys, especially by tearing them apart and having them reunite much further down the line. Maybe the curse will be broken at the end of season one but will Emma be around to be Storybrooke's saviour?