But that was kind of my point, without Microsoft, the PC would just be yet another platform like the Commodore/Amiga/Atari/Mac.
None of them would get a piece big enough of the pie.
The PC only happened due to the way OEM market was created, originating a race to the bottom regarding computer components.
My other point being that given the current state of computer market with iDevices, Android, Chromebooks, IoT, hybrid tablets (aka netbooks), TVs, Watches,..., those OEMs are now trying to turn the remaining of the market into that vision.
So besides their proprietary OSes, we get customised versions of their own forks from open source OSes (e.g. Huawei Linux, LG BSD, put your flavour here) in locked down hardware like those computer systems with their OSes written in ROMs.
Microsoft is still here, but the day they actually do loose the PC market, don't expect the "Year of Linux/BSD" to happen.
Apple (Mac) was never open enough.
None of the UNIX companies would have ever made anything cheap enough to hit the mass-market until after Windows 95 came out.
Without Microsoft we could have ended up with some weird IBM world running OS/2. They might have even switched to Motorola eventually.
But Microsoft and Compaq made things open and cheap enough to get us to where we are today.