I could definitely see this happening, and its one of my favorite shows. It'll last as long as they don't prolong major story events, which in Lost's setting was ok, but in this setting its risky.
They really need to find something better than that for the space. Narnia was a complete waste and Once Upon A time (if like Narnia) will be a waste, though I do love the show.
This show was on the bubble at first but it looks like it's just about a slam dunk for renewal now. I'm not sure this show really has staying power. If they're going to add something to the parks, they should do it now to promote the show. As a Disney shareholder I hope the show is successful, as an adult male I wouldn't watch this show on a bet. Just my opinion.