That's not the problem... The problem is Linux isn't "normal". Their work laptop comes with Windows or osx. Their home computer comes with the same.

Now go tell the average person to install Linux... To them, you might as well be telling them to open up their computer and snip a jumper to make their computer faster. To them, you're telling them to take their working computer and do something they don't really understand and is beyond their ability to undo.

It's an aftermarket modification to them. If you want to make Linux approachable, it's really damn simple. Hand them a computer running Linux, with a pretty desktop manager, and a GUI for everything you expect them to do with it. Better yet, add an app store so they can try out software and run updates without feeling intimidated

My point is, if manufacturers start selling Linux machines again, a lot of people will get on board

People aren't opposed to learning, they're just scared of breaking it, and they need to at least be able to use a web browser without going up a learning curve