graeme_p - 11:02 am on Jul 12, 2013 (gmt 0)
Not really bill, people are scared of computers and scared of trying anything new. People also think that learning to use Linux will be as hard as learning Windows was when they first got a PC. Linux does not have the marketing muscle to match Windows and MacOS (MacOS is very similar to Linux in terms of pros and cons vs Windows and has had high uptake).
Most people have not even heard of Linux, and many of those who have heard of it have misconceptions about it (such as that you need to know how to use the command link to use Linux).
The one Linux based OS that has a familiar brand attached to it has been massively successful.
A better test is this: how many people who try Linux go back to Windows?