While Apple remains quite content with its upscale OS niche - in the fat years, worth about 5%-10% of the client market, domestically.
In the meantime, in a very bad economy, AAPL is making record profit. Something Is Wrong with your picture.
I'm a hardcore Linux guy. I "signed on" to contribute my share to what has now become Linux over two decades ago. I am a programmer. I lost count long ago of how many different programming languages I've had to deal with.
I've always mocked people (or silently gagged) when I've seen people do things on Microsoft Windows in front of me - "you're in a twisty maze of gui menus, all alike". I did give Microsoft Windows XP a try 3 years ago for about 6 months in deference to a boss whom I respected. Using it made me want to drive an ice pick through my forehead.
I had never owned a Mac until the summer of 2007 when I wanted to buy a notebook computer but wanted some flavor/descendent of Unix on it. The only thing I could buy in a brick mortar store in the US without Microsoft Windows was a Macbook Pro and I like it.
It comes with /bin/zsh, /usr/bin/emacs and X11. X11 windows coexist nicely with "native" Mac windows. It takes only a few seconds knowing nothing about Mac OS X to fix the big key to the left of the A key to be a Control key as God intended - even faster than KDE. 10.4 was still a toy system like Microsoft Windows XP, but 10.5 brought virtual desktops (my *must have* feature for a serious computer).
You Microsoft fanbois can diss Mac OS X to your heart's content, but there is serious goodness in it. The Apple guys have managed to achieve my fondest dream - matching a user friendly GUI to a hardcore power O/S.
(Oh and for you gamers, has it escaped notice that the most successful gaming company, Blizzard, releases all their games on Mac?)