Realistically, how many consumers still use PCs? All my friends and coworkers seem to use their phones and tablets for everything now. They all still have laptops but they hardly ever use them. I got by for about a month after I moved by just using my phone.
phones and tablets are fine for consuming media. they are noticeably worse at creating it.
i couldn't imagine typing out long responses, sometimes with links, with a phone or tablet.
as for how many consumers still use PCs, hard to say. i know i don't go a single day without using mine. whether it's to play a game, type up a guide for someone to do something, or whatever else. on the flip of that, i also own a ultrabook that i use when i'm away from home. it's capable of doing many things, but it's no where near as capable as my desktop setup.