I think the 'war of mobile OS' as the author calls it will end just as the also still ongoing 'war for the desktop OS' will end: by the introduction of the web OS.
An OS is just a GUI for working with your files. As our devices, whether desktop or mobile, will continue to move towards an 'always on, always connected' phase it would be no more than logical to seperate the device from the OS and to launch whatever OS you feel like working with today on any device you want to launch it on.
Wherever you are in the world, whether it's on a crappy computer (with great internet connection) in a hostel in Thailand, in the train on your phone, you will always have your files and operating system of your choice available.