IIUC cathedral-style development of open source projects (i.e., intermediate development versions aren't publicly available, you can only get official releases) is now very rare; Android is the only project I can think of off the top of my head that works that way. So in that respect ESR's perspective clearly won out. Of course an essay of that length makes any number of claims and some will have aged better than others.
I think one could argue that FreeBSD is more cathedral-style than Linux, and there are other examples, especially for programming languages, where the inventor(s) want to avoid it being pulled in too many directions at once (extreme example: Jai).
I don't know that it's really such a binary either/or decision, more of a spectrum of "more cathedral-y" and "more bazaar-y."
