"Linux is much better."
For most people, an OS is only as good as the software it supports.
Moving to a new OS is tricky enough without having to find replacement apps for every bit of software you need, if even such software was ever developed (as in many cases for many industrial controllers and niche applications). Even if a suitable replacement app exists, you have to relearn how to use it, it has to support all your existing files and play nicely with all the other software you have.
For many people who only need a browser and basic office tools, moving to linux should be fairly easy, otherwise it can get non-trivial very fast.
What is needed is to start teaching kids linux at school alongside or instead of windows