I can only speak for myself and wile I understand there are cases like poster #2 I suspect the reality is the opposite of what the article says.
In my case I switched only about 3 months ago. One of the reasons I switched now is because of Parallels and knowing I can use Windows whenever I need to. I work in finance and really need Excel 2003, the Mac version doesn't cut it for me.
But outside some specialized programs I spend all my time in OSX and, more and more, I look for OSX programs for all my needs. Parallels allows Excel 2003 to act as an OSX program since it's simply another window.
My wife, who generally doesn't care much for computers, couldn't get why I liked my new MacBook Pro so much. On a recent trip she played around with iWeb and finally got a family website going. Results? She will be getting a MacBook soon and the family will move to an iMac!
If, as I understand, Macs are not just selling more but are also gaining market share I suspect there will be more and more cases like mine.
Parallels and VMware Are Gateway Drugs to Windows