Is Windows Dying in the Consumer Space?

Windows 7, the most widely used OS worldwide rose from 0% to 22% within a year of introduction, but Windows 8 is struggling at 7.5% after a year.

Life will go on as usual for Windows users at least till 2020 when extended support for Windows 7 ends - 6 years away.

By that time, if Windows 8 or its successor does not overlap Windows 7 and many users opt for Macs and Chromebooks, I fail to see how Windows will be relevant anymore in the consumer space.

What do you guys think?

PS: I hope Google and Mac users chime in as well.