Damn shame that at least one part can't be kept - museum, themed hotel or whatever, as they did with the original Liverpool airport. If you look at the pics that V2 posted, those showing the terminal and apron in 1928 from the air, it was way ahead of it's time. I can't think of another airport that has a covered area on the ramp where aircrtaft unload.
Accepting the drawbacks, as it's now in a built-up area, and Tegel is doing the job, it should still have something preserved, even if only to remember the Air Lift.