Another reason i think it would be a little odd for them to do sleeping beauty in the first episode is because they pretty much did the story in real world in the finale. I mean Emma went and fought a dragon and killed it with a sword through the chest and then went and kissed Henry. I mean Emma pretty much did the prince’s journey from Sleeping Beauty in the last season.
Perhaps the finale was meant to be a foreshadowing of what’s to come in SB in 2×1. It would be setting up season two with everyone awakening to the realization of their true identities. Also, the Sleeping Beauty story could vary from the original fairy tale to an extent that the parallel isn’t too great (like Cinderella or Red’s story in S1).
"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy