It seems businesses also believe this, even when it's plainly not true.
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PS1 = 102 million units sold
PS2 = 160
PS3 = 87 million
PS4 = 117 million
PS5 = 95 million (June 2026)
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These numbers would be bad alone, but two things make them especially awful. The first is that there's no meaningful competition anymore. XBox has completely dropped the ball whereas the PS2 initially had the original XBox (which wasn't great, but had novelty going for it), Dreamcast, GameCube, and others all viably competing in the same approximate domain.
The second is that when the PS2 launched in 2000 the US population was 281 million. Now it's 349 million. I'm using US as a proxy for rest of the world, instead of the global population, since we're mostly interested in the developed world as that's the market for game consoles. So the break-even point in terms of marketshare relative to the PS2 would be 349/281*160 = 199 million units sold, and that's if we assume significant competition.
So not only are people leaving consoles, they're leaving in droves. And that leaves the companies squeezing their shrinking player bases even harder, which will make people leave even more quickly. They've lost around 50% of their adjust playerbase over the past 20 years, and at this rate I doubt game consoles will even exist in 20 more years.