Have many (fond) memories of TXL - definitely one of the very last "different" airports remaining in Europe. Just as THF I will definitely mourn its passing, but such is life, nothing lasts forever. Just sad that they could not organize a proper "farewell" party...
As others have pointed out the move is certainly rational but also risky - they are putting themselves against the wall... but if anywhere I guess that's the place where they know how to handle such situations
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Interesting points about the lack of diversion. Leipzig would be the obvious choice and could be arranged quite nicely with proper collaboration... so won't happen. Wonder what is the "official" plan at the moment ?