Originally Posted by
Platcomike
I guess they will still use the Disney trains in the basement for access to the hotel, parking, and landside connections, but this will be great for connections, including international.
Yep. The underground train will still have its purpose. It's often full of landside airport employees transferring between terminals, as well as people going to/from the Marriott. It's also helpful for passengers who arrive at the wrong terminal for check-in. I see some of those down there every once in a while.