I don’t think any true love breaks it as Snowing could kiss at any moment, something special about what happened with Emma and Henry, and I agree Regina and Henry May be what flips it.
Emma did not get Memory potion to believe in Season 1, so perhaps Henry will figure it out. I am not sure how it will affect him. it is Hard to guess.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass