The race for the world's tallest building may be on. But it is actually a moving target. Every new project will attempt to beat out the last contender. So I think the main thing is: how impressive and how functional is the building. This is where the Burj Dubai has an absolute lead. It is the world's most modern building. Add to that the infrastructure emerging in Dubai and you will get the worlds most amazing area.

Provided the will to beat the height of the building - some project will defeat it sooner or later. But that does not lessen the value of anything in Dubai.