In November 2011 I made the claim here, and on my blog, that by the end of 2012 Apple and Android would have essentially equal market shares. And the 4th Q 2012 numbers show that I was correct. I doubt there are any wonderful prizes for this, but there it is.
My prediction was based on one simple observation: At the time I made this prediction, the relative market shares of iOS and Android in the tablet market had tracked, with the right lag, the market shares in the smartphone market. So I looked ta how long it took for Android to achieve parity in the smartphone market and predicted it would do similarly in the tablet market. And there is no reason to think this won’t continue. The point of rough parity in the smartphone market came in November 2010, and since then Android’s share has only grown, to the point that the world-wide share of Android is now around 4x that of iOS. So I expect a firm lead to develop by the end of 2013, and by the end of 2014 total dominance for Android.