To answer the question, first look at why Windows and OS X are as popular as they are currently.
Windows comes with most desktops or laptops you might buy today. To get hardware without Windows, you have to go out of your way. Dell makes machines they'll put Ubuntu on, but it's not easy to find those, and you really have to be looking for it -- which is not what most customers are going to do.
OS X comes on Macs. Most of those buyers want a Mac for whatever reason, and they get OS X with it. I'm an outlier here because one of the main things I like about Macs is they run OS X.
Most consumers aren't out there going "ok, so I need a machine that runs OS X on it, or even I need a machine I can install OS X on it." They get whatever OS comes with the hardware they bought.
There are companies selling Linux machines called "Chromebooks" :) . Again, they're not looking for a Linux machine -- or even a machine that runs ChromeOS necessarily. They want a cheap machine that's secure and can run stuff in a browser.
I think Chromebooks and even Android answer the question here. The only way for "the year of Linux on the desktop" to arrive is for some company to make a device people want to buy that just so happens to run Linux. Most buyers out there don't care what the OS is as long as it does what they need it to do, like run MS Office, run the games they play, etc.
I think macOS is at this time, the best for an all purpose machine. You have access to proprietary softwares (Adobe suite, MS Office) and FOSS sotfware (homebrew, docker). macOS is great and somewhat intuitive operating system.
I post that, if Adobe can run on linux, i migrate immediatlly to Linux here.
Macs are expensive machines.
More and more expensive and less and less customizable, unfortunatly.
There are actually other companies selling Linux machines such as Dell, System76, and Purism. I do get your point though, not much that's geared towards general users (most of these options target developers in their marketing).
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