If the exchange had just worked right to start with, things would be less severe. So, if MtGox Lag time exceeds a certain amount, I would not mind seeing them suspend trading and resetting their server or whatever is neccary so things can keep moving. If the price crashes, fine, but let it crash because hte market supports it, not because of poor exchange quality.
All this said, I do like them cheap coins! But it's not good for the stability of the market and press, and more than I want to make money, I want to see BTC succeed. If MtGox had shut down today for a few mins until they fixed the lag, the other exchanges would have kept going, I bet hte price drop would have been much less severe. All that said, I certainly don't support any "requirements" or regulation, I just personally would do that if I owned that an exchange.
They aren't idiots, when the market loses 50% of it's value, it's reasonable to suspect a crash. Don't say that if they didn't sell it wouldn't lose it's value: That's true, but are you going to lose money knowing that other people will sell and drive the market down? The line of thinking that Bitcoiners should never sell during price drops is irrational and actually harmful to price discovery. For example I think the crash was a good thing because it corrected for unreasonable price increases. (Yes, 100% over three days is in fact unreasonable and unsustainable).