If Windows were open source I bet you would have people forking Win7 or WinXP and many non tech people use the familiar thing then be forced to use the new shiny thing some designer thinks is best.

Even developers likes to focus on their work and not why their computer doesn't start again after being suspended. How many developers uses Macs? I have meet sysadmins that uses Time Machine instead of a more customizable back up system. Even Miguel De Icaza, the co-author of Gnome, switched to Mac because "it just works".

I'm a "tech person".