....ummmmmmm.
How is wild speculation not talking out of your ass? I'm not trying to be a dick, but making enormous generalizations about something you admittedly know very little about fits the definition pretty soundly.
It's ideas like these that push technology forward. A rotating skyscraper is probably unnecessary, but so are elevators...where do we put the line on defining something as excessive? I know those aren't on the same level whatsoever, but it's something to think about.
I'm just trying to say that criticizing an idea from an uninformed perspective does not help anyone out whatsoever. That's fine if you don't like the idea, but it will have no adverse effects on you, and something like this wouldn't be built if it was going to topple over immediately (not to point out the obvious...). Some of the most innovative architecture of our time is happening in Dubai, and this is just one example.
If you look into it a bit, there are already a number structures in existence with significant moving sections or unorthodox construction, so this really isn't that crazy as far as the concept goes. The engineering behind it will be a lot more radical than the idea, if you really think about it.