Holy shit, you're so, so horribly wrong. I can't properly explain why without full-on blogging, so please bear with me.
Let's say, I'm a normie living about 10 years ago, smartphones aren't a thing yet. I keep hearing about how convenient and cool these new computers are, and how much you can do with them. They're nowadays required to do a bunch of tasks you could in the past through other means. I decide to bite the bullet and buy one. I go to the local tech store, and ask one of their "experts" what would be best for me. He recommends me a laptop. He briefly explains to me how to use it, and how to look for more information, as well as answers a few of my questions, such as how to use this e-mail thingy. I end up buying it. After a few years of usage, I'm fairly proficient with it. I can accomplish my daily tasks with it, look up information on google, and play a few games. I don't feel like I need anything more. One day, I stumble across an article about how my computer spies on me. I learn that it runs an "Operating system" called "Windows". After looking some things up, I learn about an alternative called "Linux" and how much better it seems to be. I decide to try it. When I open it up, I see a few things that look familiar, so I try to do my daily tasks with it. It dawns on me pretty quickly, though, that I can't do everything like I used to. Sure, most things might be "easy" when you've finally learned how to do them, but I don't feel like having to spend another two years learning how to operate my computer.
This is, what I think, what most normies experience. Except the "installing Linux" part, since most people would be too scared or simply wouldn't care enough to even try it in a virtual machine. Why change what works, right?
The current monopoly of Windows lies in the fact that it ships with all computers. The first thing new computer users get is Windows, and the first thing they master is Windows. This is why everything else feels alien to them. Since most people use Windows, most developers, businesses and public instances expect people to. Remember that girl who couldn't do something she required for school because she accidentally bought an Ubuntu computer, and blamed it upon everything but herself, making herself look like a victim? (If anyone has a link to that news video please provide it, I lost it)
Linux is already gaining traction in this field, being commonly accepted and supported with tech-related work and schools. With actually pretty great software support, and Steam pushing for it, it has everything for a market takeover. The only parts it needs now is for more computer manufacturers/retailers to support it, and for the end users to change.
Everything you said about usability, and how hard things are on linux, is only because you, and a lot of other people are used to windows, and as such it feels alien and "wrong". It isn't actually harder, you just need to learn it.