It is completely decentralized. You're free not to use Gox at all. Contrast this with a centralized money, like the USD, and you are not free to abandon the Federal Reserve. Big difference.
Once Bitcoin is popular enough, it will be very convenient for whatever entity to take over MtG along with all the B that's in its wallets at any given time, under whatever pretense...
Lesson: don't store tons of coins at gox. Problem solved! If Gox was "taken over", a new mega exchange would spring up quickly. The need to exchange coins doesn't go away. Gox has no forced monopoly. Markets adjust.
Then it will be very clear to all of us how short-sighted and stupid we were to put so many of the eggs of the golden goose in the same old centralized baskets...

Who's putting all their eggs in the Gox basket? Maybe you're the only one?
Happy dwelling in the "completely decentralized currency" delusion! Party on!

Don't be a douche. In which currency do you dwell? And how much of a delusion are you under, I wonder?