...and basically lose your user base - especially corporate - altogether. The ability to use existing software, often developed in-house or bespoke at "we don't want to go through that again" prices, is what keeps Windows going. Break that and nobody has any good reasons to stick with Windows anymore.
I didn’t say you needed to get rid of windows…they can keep it steady and incremental like they are now. Have a parallel OS that pushes boundaries and can truly innovate!