I was going to mention Red, as well. If they only get one True Love, then that's sad because poor Red ate hers. And of course Regina would have no chance at love again. I want to think that all people have enough room in their hearts to love many times...and you never love anyone in the exact same way. That's why I like that True Love's Kiss worked on Henry, because that means parental love counts and can break curses just the same as romantic love. But magic aside, I think maybe this is Lana's interpretation. Or maybe she thinks there won't ne anyone else for Regina, thus proving the point for HER, but maybe it doesn't count for everyone else.

It's why I think the curse will only fully break once Rumple finds Bae, because the themes of parental love have been very strong throughout the series so far. On equal ground with romantic love, IMO.