The closure of Tegel is as sensible as the closure of Tempelhof was, moving the airport further from the city again and sacrifying accessibility in search of a grandeur and "global reach" airport that BER will not become. I had the luck to fly to THF a couple of times and leaving the terminal landside onto a city square was quite unique (as the terminal architecture which luckily we'll continue to be able to enjoy as it's a listed building).