Sigh. MtGox != Bitcoin. It's so painful to the community and cause to perpetuate this sad meme. I for one welcome whatever might make MtGox more reliable until someone else competent comes along.
I'm sure the other exchanges will soon follow suit. Since MtGox is responsible most of the bitcoin trades it might as well be Bitcoin.
Even if MtGox handled 100% of USD-BTC trades, it is still not Bitcoin. Many more transactions are happening on Blockchain that has nothing to do with MtGox or any other currency exchange.