It's hoopla, of course. I guarantee we will still be here on December 22nd, and if I'm wrong and the universe really does come to an end, then, well, you can shoot me or something.
Other people suspect that governments might actually use the day to stage something nefarious, thereby preying on the uncertainty and fear that already exists as the day approaches. This is a legitimate possibility, so if anything does happen on December 21st or 22nd, the first question to ask is: "Did the government stage this?"
The danger of investing your intention in false prophecy
I never covered the topic, of course. And here we still are, amazingly.
But some people really, seriously believe in the latest prophecy fad and as a result they plan their lives around the belief that nothing will exist beyond December 21st. This does not resonate well with life tasks such as financial planning. Some people are spending away all their credit cards right now under the assumption that they won't have to pay anything back since we will all be destroyed on the magical Mayan calendar day.
That approach to debt spending is really going to suck on December 23rd or whenever the bill comes due. In fact, it may feel a lot like the end of the world when you realize you prematurely quit your job and spent away a whole lot of money you didn't even have (and now have to pay it back without the benefit of a trillion-dollar government bailout).
There are legitimate threats to our world, but the Mayan calendar isn't one of them
There are legitimate threats to our civilization from GMOs (genetic pollution), the pillaging of natural resources, loss of top soils, the polluting of the oceans, rampant infertility caused by synthetic chemicals, and even threats from hare-brained scientific experiments that could theoretically create black holes which consume the entire planet.
None of those are fiction; they're very real. And on top of that, there's also the coming debt collapse which won't actually destroy the world but will make you wish it had been destroyed due to the rampant poverty and starvation it will likely unleash.
But even with these real, legitimate threats, that's no reason to live your life as if it's all coming to an end, because in truth, nobody knows the timetables on these things. The economic collapse, for example, could happen tonight or maybe in 10 years. It's hard to tell exactly when things will reach a point of collapse. So while it's smart to be prepared for the unexpected, it's not prudent to allow your entire existence to be dominated by the thought that it's all coming to an end on a specific calendar date.
Unless God himself broadcasts a multilingual message from the heavens that announces a specific time and date that he's going to "end the simulation" and close the cosmos, you would be wise to stay on course with your life and not bet all your cards on a prophecy dreamed up by ancient humans who hadn't even developed an alphabet yet.