Earlier quoted context omitted.
"Even the Android hegemon, which supposedly poses an existential threat, could easily fracture if Samsung decides to go their own way." I highly doubt Android would fracture if Samsung goes its own way. A number of manufacturers (Motorola, ZTE, even Xiaomi) would fill the void if Samsung leaves Android. I highly doubt Samsung would do it. Samsung doesn't know platform. Microsoft does but it still struggles to convinc…
Maybe, but I'd be surprised if Google didn't port their apps over to this imaginary platform. My larger point is that now that a rich UI is becoming a commodity, non-software/platform factors will become increasingly important e.g. manufacturing, distribution, etc.
Google is releasing iOS apps because there's no way Apple is going away soon.