they unfortunately can't put jetways off of the main terminal to the ramp without a new gate area built. Below the terminal floor area is the bag room, then you have a 2 lane roadway & then a large concrete fence. They threw the idea around a couple years ago but scrapped it until the DOA figures out what they are going to do with Terminal 2, and considering UA
has the lease on T2
and they're in bankruptcy, I doubt they'll be doing much to it.
Also something to consider is the fact that since UA
pretty much owns the E/F gates, they also house other airlines. Why would United put up a pretty penny, like they did in the late 80s with the Terminal for Tomorrow/AKA T1, for other airlines to share in its expenditures?
Look for a midfield concourse where the AFB used to be housed.