like what if linux still was open source but had a lot of proprietary dependencies and packages and became more popular and therefore proprietary software came to it?? but it still would let you use any desktop environment and there would be a new proprietary desktop environment which was like gnome but easier
Steam on Linux brings us closer.
What prevents this is having control of your desktop and multiple processor options. If IBM, Dell, HP, Asus, etc all sold hardware that was completely incompatible with each other and you had to always repair your computer the same way with specific parts (like a Dell motherboard) then you would see something like this.
An example of this is OSX, a BSD derivative.