In a way, we already have it in the form of ChromeOS, and I certainly don't want ChromeOS or Android to be the default experience, or for the community to start to cater to that model.
All of the things Linux would need to become to get Windows level marketshare would strip away what makes it appealing in the first place, in particular, full user control. I don't want a nanny desktop, but that's exactly what it would become.
Linux can stay niche for those who appreciate it as it is.