Yes. The browser is already like second OS. So if Google provides the Android API through Chrome. And if Chrome comes with PlayStore, then a lot of people will

Yes. The browser is already like second OS. So if Google provides the Android API through Chrome. And if Chrome comes with PlayStore, then a lot of people will be able to run Android apps on Windows 7+, macOS and Linux. And as a next step, people will ask themself why not just buy a notebook with Android and run 1-2 legacy apps via Wine or whatever. And the new announced (on Github) Fuchsia OS that may replace some rusty parts may happen like Win98 to WinNT. And MS can do little to prevent it, their Phones and tablets have a 1% global market share, their store is a joke, their UWP platform failed (Win10 exclusive games like Quantum Break already backported to Win7 and Steam), and they still do their best to scare of their long time users with their aggressive style, that was unheard of during Balmer era. So Google has a very good chance to win the desktop market share big time. Just don't forget about enterprise customers!