The market will regulate itself, we can't stop stupid people from being stupid unfortunately. We will see better exchanges, Mt Gox's days I feel are numbered, unless they can step up their game. Although, ironically, I think one barrier to stopping Bitcoins from really taking off (the other just being the immaturity of the market) is the threat of government regulation. Why would an established legitimate business adopt Bitcoins if there is any threat from government regulation or outright outlaw. Sure, they can't stop Bitcoin from operating undercover, but they can stop those with business licenses from using it.