There’s very little in the article to indicate imminent demise. A few valid complaints, yes.

Games should be supported across all platforms but the article did not mention a viable alternative for Mac based gaming.

Extraneous launchers are an issue, but I’m not sure what Steam could do for that when they’re the storefront, not the developer.

The article also expresses a concern for continued dominance as a platform so it goes against the title as well.