Call me when it's 1024 meters.
Honestly, I think it's awesome this is being built. And to the people whining, "Oh, what if a plane runs into it!" - well, what if a plane runs into YOU? What if you slip in the tub, fall out of a tree, or get hit by a bus? The day we start defining our futures in terms of least possible harm rather than greatest possible achievement is the day our hearts die.
I will gladly sign up to be the first tenant on the top floor of a big-ass building, with a bullseye painted on the side, surrounded by airports, and every one of us should do the same, american, arab, israeli, russian, chinese, whatever.
The Roman aqueducts might have fallen down and they still built them. The leaning tower might have tipped over but they kept going. Venice sunk, filaments burned out, Apollo 1 burned, and we still have canals, the light bulb, and space travel.
The goal of terrorism is to force a society to change, to crimp in on itself, to cripple itself from within with fear. Terrorism cannot be fought with guns, words, or politics - it can be fought only one way: When they knock your building down, build it the same way, without a word, without reaction. When they infiltrate your security, don't change a thing. When they scare you half to death, stand straight the f*ck up, look them in the eye, and say, "I will not be intimidated."
Do not change for them. Do not make your travelers prisoners, do not make your private matters public, do not suspect your neighbors, and when you want to build the tallest building in the world, whether you are american or arab, build it even if they might knock it down tomorrow. To do otherwise is defeat.