@pleonasm - I think the Burj was an exception, just because it was so massive and was being built in an area that just didn't really need it for commercial purposes. That could happen at any time. Businesses sometimes take stupid risks.
I think it would be so difficult to become a respected skyscraper construction engineer that you would end up in a field without many competitors. So, even in a recession, you would probably be OK.
Plus, I mean, even if your specialty is skyscrapers, I think you'd still be able to draw up blueprints for other kinds of buildings.
So, all in all, I'm sure it's still a very good job to go into, if you don't mind the student loans and all.