I'm currently in the middle of running an "Arduino for Beginners" workshop series at our local hackerspace. We have 25 attendees, 24 of them are brand new to the hackerspace. All the attendees are technically literate and interested, but only one or two are programmers or heavily into technology. Everyone brings their own laptop.
The first hour of the first session was almost entirely spent with everyone setting up their laptop with the Arduino software. At least 3 of the attendees took closer to two hours, both with weird Windows problems and driver issues and random slowdowns, unexpected software alerts, etc. One took more than the workshop's 3 hours to get running smoothly, her laptop finally deciding it needed to install many dozen security updates.
All four of the people whose Windows computers caused them such slowdowns told me "I barely ever turn this on any more, I just use my iPad/tablet and phone at home."
This is purely anecdotal and it's a small sample size, could easily be non-representative. But it did make me think, if I wasn't a geek and a hobby programmer/tinkerer then I'd pretty much just do email & web browsing at home, occasionally update/print my resume or write a small flyer. Would I need a PC? Why would I bother to own one, especially if PC maintenance was of no interest to me?