Some people (like me) have invested a lot of effort learning how to use Windows. Some of those aren't particularly interested in technical superiority. The just want to use a computer in the sufficiently good way that they already know. Personally, I find Linux difficult to approach, because of the overhead involved in just getting back to my current level of proficiency. If I needed to learn it for a job, I would. I might even do it independently, eventually.

It's similar to the dominance of QWERTY.

But even I would much sooner learn how to use linux, than embark on a crazy project like this.