re: Nokia Lumia 920 PureView, Lumia 820: Colorful Designs
For desktops, I certainly agree that the difficulty to switch platforms is there, both in learning a new OS, but also in the significant costs of buying new hardware and software (which is in the tens or hundreds of dollars). However, from a smartphone perspective, they're all simpler than desktops/laptops, and hence much easier to adopt and switch.There's the obsolescence cycle that has most people upgrading to a new phone every two years or so, not only because after two years, most smartphones are relatively obsolete, but also because the phone would have been dropped, scratched, battery life reduced, etc. Smarphone apps also tend to be a lot cheaper.
In any case, I do hope the smartphone market remains competitive, with a few viable options rather than just iOS and Android-- this competition benefits all of us as end users.