I don’t think Wonderland will go beyond this single season. The best thing to do would be to bring the Knave over to Once (and perhaps Jafar and Red Queen too if possible). I hope they do finish airing Wonderland.
Adam and Eddie they only have story for one season 🙁 so, I hope they get to tell it all.
I love the idea of bringing the Knave back over to Once. First time we saw him, he was in Storybrooke anyway.