TL;DR Bitcoins are possibly even more flawed than any other kind of currency. There is one person who controls the flow of Bitcoins and can unmake transactions it doesn't like.
As long there is someone, somewhere willing to put up products or state currency in exchange for bitcoins, bitcoins will have their value. The best case scenario for bitcoin could be for MtGox to go down in flames because if it bitcoin held its value, it would prove that its fundamentals are sound, and its price is based on legitimate demand for an anonymous medium of exchange, not pure speculation.
If a MtGox collapse did cause a bitcoin collapse, it would show that bitcoin is not the real deal, just the result of a speculative frenzy. This may be hard to stomach, but it's better than continuing to ignorantly pile money into a bubble so fragile it can be popped by the guessing of a single password.
In my opinion this guy, if he really wants the best for bitcoin, should sue MtGox hard if he honestly thinks what they did is wrong/illegal/breaks contractual agreements. Let bitcoin sink or swim on its own merits.