And you wouldn't expect every driver to drive a manual transmission. The auto transmission is easy and just works. When you try to teach these people to drive a manual, most will not enjoy the experience or see the point of learning it when you can get an automatic transmission.
People like simplicity and familiarity. People are resistant to change. Linux will not win the OS war unless the user friendliness is worked out fully. And don't tell me Ubuntu is already there, it's not there yet. People still have trouble using an iPhone.