Yeah, I like your article but consider this… PC gaming isn't what you think it is. It's a place to build games for consoles, not the other way around.
It's never ultimately going away because hardware and software development is a side effect.
And the Steam Deck, as you point out, is not the second coming of Christ because they don't need it.
However, it extends outward into a new niche market, a much more extensive ever-evolving library of titles. This library is far more expansive and less restrictive than Nintendo, or any other console for that matter, filled with more cross-platform.
Oh, and they are making the buyable hardware piecemeal. What does this all mean? It means we can replace components as needed, which means we might upgrade them over time.
I wouldn't write that off.
Just my two cents!