First off, I know I'm a bit a crazy about this, I really do go a little overboard when it comes to HP Phase 2. 2nd off, yes, they could open a portal, but how would you explain being able to see one from the other? One of the best parts of theme parks is having a good theme, both for the land and the entire park. Unless there's a way to explain it, it wrecks the theme of the area.