Did you miss the 72% market share of Windows on desktop machines? That is still a massive market, and if nothing else, pulls consumers into the rest of the MS ecosystem.
So I doubt MS is abandoning OS development any time soon.
I don't feel like MS ecosystem is that attractive to consumers. In enterprise for sure, everyone uses Teams, Outlook and MS Office, and Azure is popular for hosting. But in most people's personal lives it's smartphones that are most utilized, which naturally draws people to Google's and Apple's ecosystems.
Only reasons I even bother to install Windows are gaming and MS Office provided by my university.
So I doubt MS is abandoning OS development any time soon.