re: Why Android's Dominance Is Bad
The duopoly is a natural phenomenon, called the Red Queen effect where two competitors are locked in battle with each other and are constantly improving, pulling them both ahead of the competition. We saw this with Microsoft and Apple in the computer domain, and see it now with Google and Apple in the mobile world. This is a natural process.
Of course, had Microsoft not mis-stepped with their first mobile offering, things might be different. Windows 8 is (according to my testers) awful. My guess is that Microsoft and Nokia have signed a mutual suicide pact. Of course, Microsoft is too big to die, but it is quickly being relegated to the back of the pack.
On the Apple front, my guess is that the pressure from Google will result in Apple opening their platform to allow people to build and post apps without running under the App Store toll bridge. This will do a lot to help (although their hubris is such they don't think they need it.) And, of course, once HTML5 becomes ready for prime time, developers won't care about platform at all!