Apple watch is for people who already have an iPhone. It's not a game changer for a wider market it's a peripheral. a successful peripheral.
My point is, peripherals can be successful and game-changing.
The day watch becomes standalone and/or compatible with Android is the day it has a chance of becoming a true game changer. Until then I wouldn't even describe it as a peripheral, but just an accessory for an iPhone really.
https://en.wikipedia.org/wiki/IPod#/media/File:Ipod_sales_pe...