Yeah, right when that future I've been hearing out for like a decade where everyone just uses an iPad for everything comes around then they are in real trouble (I imagine that will be a year or two after the Year of the Linux Desktop).
Especially with the new iOS 11 changes. I mean, the only thing keeping me from using an iPad for everyday use is I can't do any code in it.
Aside from that, everybody is already using their phones more than their desktops, and even when they do use their desktops, it's to access the slightly uglier version of Youtube on Chrome...
Probable future will be entreprise and schools using Chromiums/Windows 10 (very closed platform, but that's not a bad thing), and iPad/iPhone (or not iOS) for every other use.
Here I say: "[citation needed]". It surely is rather the complete opposite of how I use the devices (phone: about 0 hours (I don't own a bugging device with telephony functions), PC - hell a lot).
You have to try it for a while to get used to it and sort of understand how to do it since it's slightly different… But it works SURPRISINGLY well. And the amazing size/weight/battery life of an iPad as well as the cost relative to most Apple laptops makes it attractive.
Since I got a good iPad I really do rarely touch my Mac at home. Mostly for games that aren't on consoles.
I'm not sure why people are so hostile to iPads. For what a TON of people use computers for they are easily past 'good enough'.
Also, phablets have eaten into some of the demand for them.