I agree that Regina will find a way to get her hands on some sort of magic. It’s almost inevitable. But we’re not exactly sure how she got her powers in the first place. After learning that her mother Cora was in fact the original millers daughter, I have a feeling that she got her powers from Rumpel. That puts her in a very vulnerable position. If Rumpel was the one who originally gave Regina her powers, then she may have to look elsewhere for more magic.