Capitalism ALWAYS cares about losing relevance in a market. Capitalism is addicted to growth and eventually PlayStation's investors are going to start wondering why a revenue stream is drying up.
Sure. But they are gaining revenue in other markets.
Personally I think Sony saw this coming after shelving the Vita. Is it the right choice? I don't know, I'm not a shareholder. But it doesn't seem they mind.
Edit: just read the full comparisons. How can you compare a console at the end of its cycle with a console on the highest point of its cycle? PS5 is also selling well in Japan? What is this whole thing?