Making Linux significantly better to use on the desktop would require taking tight control of the GUI stack [EDIT: really, the entire multimedia stack] to de-ba

Making Linux significantly better to use on the desktop would require taking tight control of the GUI stack [EDIT: really, the entire multimedia stack] to de-balkanize it and integrate & standardize its various layers, which would also mean modifying practically every program that uses it (which is why one can't just declare some GUI stack their official one and be done with it—the overall experience will still be super-janky). That's... let's go with unlikely to happen.