Unsupported hardware is a reasonable argument for using Linux on that system, as opposed to buying a Windows license for that system or upgrading that system. You are living a fantasy if you do not believe Linux is useful for many people even in its current state.

There is no pretense that it will take over the world, just like Windows never took over the world. However, there is little doubt that Linux will be relevant over the next decade. Nobody is requiring that anybody else use an operating system that they dislike, but I think that you may be sad that you missed out on some very tangible benefits when you look back from some future point.