Boy, do I wish that would happen (even though it's been made very clear by insiders that we shouldn't expect it). However, I'd place the entrance in the far-west-side walkway between Adventureland and Frontierland, and make it a prominent structure like the version at Tokyo DisneySea. Otherwise, too many people will pass it right by without realizing that it's an e-ticket.
Also, any new addition in Adventureland should be an excuse to remove Aladdin, and make Adventureland once again an immersive environment.