Today, Medicare can throw a doctor in prison for making a series of mistakes on claim forms. If things get bad, the Communist party will be able to make a comeback. Banks aren't raising reserve levels, and the Fed isn't changing the requirements. We're still looking at a risky money pyramid, and if the public decides to take out their cash, there simply won't be enough to go around. It might work, too.
Any terrorist welcomes disruption, especially in emergency services.
But they're legitimate concerns. Each one represents a real-world risk that might occur around the Y2K rollover. Then again, they might not. Earth changes, Biblical prophecy, psychic predictions, nuclear war, La Nina, crop failures, a virus outbreak, you name it. But the goal isn't necessarily to name the threat.