It's not that I'm saying command lines are impossible to learn, what I'm saying is that people will take one look at them in Linux and stick with Windows. They won't want to try to learn, because Windows doesn't force them to.

The aim of something like Ubuntu is to win those kind of people over to Linux, and command lines are a serious obstacle in that task.

20 years ago (and I remember because I did it and so did my friends) people got along fine with loading applications from audio cassettes that took up to 10 minutes per app, or even more if it was a multi-load. People were willing to do this because disk drives were prohibitively expensive at the time, often costing more than the computer itself, whereas cassette players were extremely cheap.

Things have moved on though, drives cost nothing, so people won't put up with a loading delay longer than a few seconds. Even though the cassette system was viable in its day it no longer is now, and no one will ever put up with a 10 minute loading time ever again, even those people like me who did once do so.

The same goes for command lines, they were fine in the days of MS-DOS when there wasn't much choice but are no longer okay today (there was the Mac of course but it was tremendously expensive compared to a cheap PC clone).