The PS4 isn't selling, the idea of the PS4 that Sony sold pre launch is selling. Looking at the PSN issues recently, people are realizing Sony is running off Snake Oil fumes.
As ridiculous as this might appear at first glance, there is a small element of truth and it shouldn't be dismissed because of the rest of the post.
What is really selling the PS4 over the X1? It's certainly not the exclusive software. It can't be games like Destiny, which are also available on the competing platform.
So it stands to reason that people are buying into the idea of the PS4 more than anything else. It's the platform of choice for this generation, everything about the platform has fed into this idea, from the day it was revealed to the day it launched, there's been a strong belief that the PS4 is the only console to get.
it's the true games console, the only one that will provide the best and most engaging gaming experiences. The idea took root and it's one that MS will be fighting (a losing battle) for the entire generation.
People can pretend MS has a chance so future NPD threads will be entertaining as we act shocked at how much the PS4 outsold the X1, but deep down, everyone knows it's already over.
Sony won this generation on May 21 2013 and cemented their victory on November 15 2013. Anyone who pretends otherwise is lying themselves.