We only have two operating systems now Windows and Linux. (MacOS for the desktop as well).
It becomes a mono culture, and it takes away healthy competition and innovation.
I want many more operating systems, not fewer.
I with MS would make it free to run Windows Server, (something they move towards with the CLI only version). In order to hopefully increase adoptation.
I dont think that will happen as long as MS has a lot of enterprise custoemrs who are paying huge for the Server licenses.