The article states straight up that Win32 is used in way too many applications for Microsoft to ditch it wholesale in the foreseeable future.
What they can do is tweak around the edges to make Steam perform poorly and theoretically make the Windows app store more appealing, but that got a little bit tinfoil hat for me. I won't say it's unheard of, but they've already been under investigation once for these kinds of shenanigans and it doesn't look like we're going to have a friendly administration come in to pull their feet out of the fire this time.