I must say that as much as I like Frozen, I am looking forward to seeing Elsa as the villain (since I have read that was the original concept for Frozen). I am picturing Arrendelle flashback/s with visits to Rumple rather than the trolls and chaos kicking off from there. I am also interested to see how they could work Anna into this scenario.
Oh and Pan, interesting theory about Narnia, but I am no sure about adding Narnia to the chaos, as the wardrobe entry would seem to open some problems with the no travel between our world and a magical one (and there CAN NOT be a third version of England for the wardrobe to be in).
“The truth isn't easily pinned to a page. In the bathtub of history the truth is harder to hold than the soap and much more difficult to find.” - Terry Pratchett