It’s exactly due to immutability that Linux is reaching even more people. An example is SteamOS, an immutable distro.
Common user doesn’t wanna know if he’s using X11 or Wayland, or if your distro is immutable or not. He wanna knows if the distro works and if he can do their stuff. And that’s the exactly reason why Windows is the best alternative for them.
Not everyone is tech-savy to care about the engines that make an os work or to tweak every aspect of the system. Actually this is minority.
Off course your disapointment and contempt with Wayland and immutable distros is legit. I’m not arguing against it. You have your reasons and respect it. But please, don’t jump to conclusions like “it will sabottage linux desktop” with no evidence.