It’s a dream. The story isn’t ready for that point, yet. There’s not enough people who are (excuse me for my lack of vocabulary) “fixed” yet. As in, their characters aren’t who they’re meant to be. Such as Mary Margaret isn’t fully Snow White or David isn’t fully Prince Charming. Not to mention that there’s a whole lot of Storybrooke to be mended. Remembering is just half of it, they have to become what they’re suppose to be.