There's nothing stopping different organizations from making very different distributions of Linux, with some optimized for casual users and others optimized for techies. We're already had this for ages, with Ubuntu being aimed at more casual users and Gentoo/Arch/etc. being aimed at more technical users for instance. If Microsoft dumped Windows and made a new version of Windows based on Linux internals (but of course lots of big changes to make it more like Windows, plus a bunch of telemetry and advertising crap), that wouldn't prevent other distros from continuing to do their own thing.