>Most people don't book a holiday on an Airbus 380
Quite. And most users don't care about the OS as long as they can launch the app they want to use and it works. Which is why they are attracted to a familiar desktop.
The problem with a bunch of Register readers discussing this stuff is that we are very different from the average PC user, and the average user represents the vast bulk of the market.
So, talk to the average user about Linux or windows or whatever and they will switch off because they are only interested in getting to their email etc.