What other choice is there?
With the availability of Windows 7 machines fading away, consumers will have no choice. As has been stated, desktops and laptops, while no longer the only game in town, are still an absolutely essental part of the computing landscape. When there's nothing to eat but spinach, everyone will eat spinach - or starve.
One thing this will do is to push me, personally, away from Microsoft Office. My ancient, though perfectly adequate version, I'm told, won't play on 8.1. While I'll be stuck paying for an unnecessarily powerful and expensive 8.1 machine, I'll be under no such compulsion to lay out big bucks for the next version of Office. Hello Google, goodbye Office.