The world was saved, everyone had a uneventful New Years. The world went on as normal. Because the problem still exists. First, the United States, as well as every other industrialized nation is extremely dependent on computers and the internet to run their daily business. Shipments of food and medical supplies are determined by a few keystrokes.
People use credit cards instead of cash.
Everything is done electronically. There is a gross over-dependence on computers, and a general misconception that nothing could ever go wrong with them. But in light of recent events, that may not be true. Both of these were simple pranks sent off by hackers who did not have any intention of causing major damage. But they did.