"Five years ago, they probably would have been, but then Ubuntu
arrived. Ubuntu is an operating system I can put my wife on and she
will not be any more lost then she is on Windows. That is a big
step for Linux and open source: Having an operating system that can
compare favorably to the commercial ones.
"The gap is also closing. Ubuntu gets easier to use and have
more and more “end user” features. I already think
Ubuntu is just as good as Windows for a typical user, and of course
superiour for a developer like me. OS X seems to get a bit more
developer friendly as time goes on too."