What you're calling fads aren't fads. Just new technology that at the time, we weren't sure of their longevity. CD, and to a far lesser extent DVD, are slowing in popularity but took decades to do so. That's not a fad, that's reliable and well received tech that succeeded at it's purpose. Mainstream consoles fully supported motion-controls since 2006 and they're still here and going strong nearly 12 years later. Touch screens have been here even longer than mainstream motion-controls, and pretty much dominate mobile gaming input methods thanks to modern cell-phones.
With that sad, the PS4 didn't bring us anything drastically new. It was largely a refinement of what was present last gen (more power, less waiting, improved main-controller, improved online experience, etc). So I get what you're saying. However, the same is true of it's main competition the X1. These two consoles launched around the same time and back then it was pretty clear which was better. At launch, the PS4 was more powerful, was cheaper (even if you wanted the camera which wasn't optional for X1), games installed faster, and at the time it seemed to have more exclusives on the way. The choice was obvious and SONY's just been able to hold onto that momentum.
4 ≈ One
