alt Hacker NewsI think that's the most likely way it'll go.
Windows will remain as the default "enterprise desktop." It'll effectively become just another piece of business software, like an ERP.
Gamers, devs, enthusiasts will end up on Linux and/or SteamOS via Valve hardware, creatives and personal users that still use a computer instead of their phone or tablet will land in Apple land.
With the massive adoption of web apps in Enterprise I have seen I would expect Windows to become irelevant or even a liability in business use as well.