It would be cool if B6 took the old Saarinen terminal and made it their international arrivals building. It would house all the international flight equipment etc. You build an enclosed, elevated walkway to the tarmac near T6 or even into T6 if it isn't demolished while closing it off to non international flights. Folks taking a B6 int'l flight could be dropped off right in front of the TWA terminal. People connecting from a domestic city could utilize the walkways from the new T5. Everything's solved except for maybe space considerations with all that int'l equipment in the Saarinen building. And that walk way wouldn't be all the cheap, especially going under the existing one to T6's Airtrain station.

Note that another use [read rumor] for T6 that I've heard is turning at least part of it over to JFK domestic carriers or pre-clearance flights [Canada and Shannon, Ireland]. Sun Country, United Airlines, US Airways and Virgin America all operate domestic flights and could possibly use 8-9 gates or more without interfering with T5. Maybe BA's LCY flight could use this too?