Long term, the possibility is that America will be a more interesting place, with a giant island just off the west coast, with many hundreds of miles of new shoreline for developing. But in the near term? We'd be looking at on the order of ten million dead pretty much instantly... with perhaps a few dozen million more deaths in the months that follow due just to the basic effects of the quake. This does not take into account the deaths that will be due to the crop failures in the Midwest due to the ash darkened skies and increased radiation due to the India-Pakistan nuclear war, the Israeli-Iranian nuclear exchanges, the burning of the Korean peninsula, China going after the Japanese and the Russians invading Europe. Millions elsewhere will likely die due to the prompt stoppage of American economic and humanitarian assistance.
One must assume every government agency network has been penetrated. We should probably run that demo software that found these two hacks on other systems. If you are on the list of victims for this, it is best to assume that the Chinese have a dossier on you now and will look to exploit you at some point. Or the Chinese will sell your info to someone else that will have other uses for you or your information. Make sure you change any of your password reset information that may be contained in your SF-86 forms.