This is more about a crappy exchange that has been crappy for most of its existence than about Bitcoin itself. The sky is not falling. MtGox may fall after this, but IMO that would be a good thing.
No, this is more about the freedom (and naivety) of the Bitcoin community. When you don't have any type of regulation or oversight in place, you get this type of free market free for all. There is no one single authority out there that can force Mt.Gox to clean ups it act. The only people with any power over the exchanges are their customers. But the customers aren't pushing for change for a variety of reasons. They either lack knowledge of these issues, knowledge about how these technical issues can cause problems, or have a vested enough interest in Bitcoin to overlook (or even down play) these issues.
I don't think his statement was with regards to Bitcoin itself. Calling it "a real tradeable asset" implies more about the market around buying, selling, and storing Bitcoin than the Bitcoin protocol. And its hard to argue that market is anything but immature.