The amount of stupidity in this thread is unbelievable for the most part.
People are acting like the builders, the engineers and the government all learned of this right now, when in fact they knew about this issue before construction began. It is only NOW, that the media has picked up on this issue, and since construction has already began, they have decided to blow it up and make it seem that nobody knew about it.
This roof is modeled after Commerzbank-Arena in Frankfurt. If you go to its Wikipedia page
http://en.wikipedia.org/wiki/Commerzbank-Arena there is an entire section devoted to its roof, and its positives and negatives. I read up on this when the roof was first announced, and if people weren't sheep and actually did 5 minutes of their own research, instead of looking towards the media for all their information, they too would have known about this issue long ago.