So if you don't get a chance to log in before trading starts.. your orders will still be there and will execute? I hope that's not how they do it.
I'm sure someone will correct me if I'm wrong, but from what I can understand, this is all up to Mt. Gox, isn't it? Not really much the users can do about it.
To prevent it, no. To respond to it? It's called "a run on the bank."
If whatever action Mt.Gox takes pisses off the majority enough, they suffer serious loss of business. Note that the definition of 'enough' assumes enough to outweigh uncertainty over the alternatives being newer and not as well proven.