It was great, we don't need UNIX monoculture.
Unix stuff has only recently been "in the norm" for dev related workflows, it used to be entirely Windows only.
Same with office workflows, games (both playing and developing), graphics, etc.
Unix is the rebel here. It is bringing the diversity.
(Currently my workplace is probably 80% Mac, 19% Linux, 1% Windows, but I can see their point that it would be a lot easier to administrate if they were a monoculture of Mac).
The world is bigger than the desktop.
Already your assessment regarding AIX being dead, when it is one of survivors from UNIX/Linux wars shows how your Microsoft hate blinds your judgement.