It was nice seeing that they actually did have something in mind by introducing Sleeping Beauty to the story. My guess is that, aside from being a way for both worlds to communicate with one another, they'll use a combination of the sleeping curse and the dreamcatcher to get them all back to Storybrooke. Especially now that they have access to fairy dust to supercharge the dreamcatcher.
One thing that I don't understand is that the whole point of a bean stalk is to grow beans. So... why aren't they just able to gather them from the one remaining stalk? It's clearly still alive, so it should be growing them, no?