Easyjet moving into the Airberlin terminal at Tegel would certainly take a bit of pressure off Schönefeld, where the terminal is bursting at the seams. Even Ryanair would probably welcome that, as the date for opening BER recedes ever further into the future. The transport minister seems to be in favour of keeping Tegel open as long as possible, maybe indefinitely. But that would be logical, so its probably not going to happen.