I don't know what can replace it right now, for non-technical users, but the market is ready for an OS that isn't tied to hardware (MacOS) and doesn't require as much expertise or effort as Linux variants (especially when running specific software).
Microsoft is here with Windows 11, integrating teams into the OS, because they want to shill it, not because it's what users want. They are making claims about it being more performant, but that's hard to imagine when considering their promises for backwards compatibility.
Windows is a bloated nuisance OS that only stays around because of legacy software and DirectX. The folks at Microsoft who work on Windows have demonstrated for decades now that they care more about implementing new features than they care about user experience, consistency, and reliability. Here comes another UI overhaul instead of simply fixing the trash menus and numerous other problems the OS has. Why?
It's time to move on from Windows.