While no one disputes that Linux is a good OS, there is also no doubt that, it’s not ready for prime-time when it comes to the PC market, as demonstrated by the rejection of the OS by 99% of consumers for more than 20 years. But, keep trying; Linux might become the OS of choice after Windows and/or Microsoft drop dead, some 200 million years in the future.
Linux's problems as a desktop OS are two-fold: 1) there's no space for it in the marketplace, and 2) it's not Windows.
If Linux looked and worked just like Windows, and could run Windows software seamlessly, it would be massive by now, because it's free.
But it never will be Windows, so as you say, Windows will have to die first before the Linux desktop has a chance in hell.
OTOH, in the server marketplace, Linux rules and its strengths are manifest. That's clearly its proper place.