I really don't know how to react to things like "gaming as we know it would die if there was no PS4," when Xbox One and PC offer very similar experiences. In fact, the PlayStation ecosystem moves closer to the PC world every quarter, it seems.
The fact is the console market is shrinking, and PS4 has done nothing to reverse that trend. It's simply winning over the console enthusiasts that remain. PlayStation isn't expanding the pie; it's taking over a larger part of an ever-shrinking pie.
So, no, PS4 isn't the savior of the console industry and it isn't the ultimate justification of console gaming. It's a great system with awesome exclusives...isn't that enough? Why do we need to venture into apocalyptic territory?
As for the last paragraph, I never requested or assumed any loyalty from third-parties. I said Nintendo, because of its stable of first-party games, can survive without the patronage of AAA third-parties.
The fact is that Playstation is bigger than ever and their market is not shrinking. How big the outside market is was never relevant to them. How good the Wiis or Gamecubes do didn't impact them. The only times a console affected their business was the 360 and it was because of their own stupidity otherwise the PS3 would've even outsold the Wii last gen. Anyway, the PS4 is doing exceptionally well in new emerging markets. Sony has been trying to launch in more new markets than any other platform holder, they go the extra mile with localization efforts. In the long run this will be an asset. They've also PS Now, showing they have a plan B in a console-less future. They've done more to expand the market than others and it made them future proof if things change drastically. They've done well when the Japanese console market tanked, the other Asian markets are offsetting what they lost in Japan. Even for their 3rd party games like Yakuza and FF. So Playstation can stand on its own even if others fail, it has done so pretty much the entire past 2 decades. The install bases between the 4 PS consoles over the 6-7 year period in a gen have been consistent: 85M(PS1-PS3) to 100M(PS2). Considering there is more devices than ever trying to grab people's attention, PS4 is doing great. It will get to 100M within 6 years.
There is not 1 large pie, rather multiple pies, Sony's pie has the same consistent size. If I were you I'd look at why the others have such inconsistent, fluctuating sizes.