donno I think pc sales have been stagnant or slight growth (very low single digit) a year. Mac desktop IIRC has been growing an order of magnitude fasterOne question, what are the totals? The percentage is lowering but are the numbers declining?
heres the most recent figures I can find
http://www.engadget.com/2012/07/12/idc-and-gartner-pc-market-flattened-out-in-q2-2012/
-0.1% decline in growth, though mac numbers (which grew 12% are included in that) so PC numbers prolly shrunk by ~1% year on year, so yes windows PC numbers are shrinking
#3 well for indie game developers (like most ppl on this site), theres far more money in the android/IOS side of things than in the PC indie scene.
US numbers (in just under 4 years)
jan 2009 - windows (XP/vista/win7) 90.69%, apple (OSX,ios) 6.73%
nov 2012 - windows (XP/vista/win7) 76.87% apple (OSX,ios) 19.8% (OSX = 14.89%(*))
Yes MS (whom I think make the best desktop OS) are still king on the desk/lap/top, but the world is changing rapidly now, tablets,phones are ubiquitous. Perhaps the MS surface can change that, but I have my doubts. like the BBC website said so far reviews have been mixed the buzz so far is not there.
(*) i.e. the number of laptop/desktop mac's in the US has more than doubled in less than 4 years!
OK the numbers in china/india are like ~99% windows ~1% other, mainly due to piracy, but MS doesnt see much money from these pirated systemOS software






