No, they don't. I was there in 1998 when Netscape released their code and not much later, the Cathedral and the Bazaar was written by Mr. Raymond, and everyone rejoiced. What happened then? Linux on servers, and hardly any dent on the desktop.
Now we proclaim the death of the desktop, and perhaps this is a spot where Linux might, or might not eventually gain the upper hand.
I was waiting through the 90's and the 00's for Linux to make more than a slightly measurable dent in personal computers, as opposed to embedded devices (a so so market penetration), and servers where it has done fantastic, but Windows is there too, in the server space.
Having spent most of my time working in Unix/Linux shops and cobbling things together with roughly hewn programs, lacking, many times, basic documentation, I now happen to work in a Windows shop. The integration is astounding, and the Cathedral and the Bazaar was wrong in this way, it assumed that developers would develop to the nth degree for the sake of the cause. This doesn't happen. To get developers to achingly continue to get a project (interfaces, games, business programs like Office) *properly* prepared for the masses, you have to pay them mightily to do it. You have to dump the cash, or you get crap. No one likes busy work, which is all of taking a program from a rough stone, to a highly polished gem.
Don't tell me about how, Linux rules. Personally, I can totally live without it. After all of the unintended and tacitly broken promises made by the Open Source community over the years, and all of the searching on Saturdays and Sundays trying desperately get something working before the Monday traffic hit, it's ironic to now see, crop after crop of people saying, "Linux won!"
In your dreams.