Actually, I do agree with Ozh. My family/friends/etc. also navigate via search engine (my wife uses Yahoo, most everyone else uses Google).

I'm also not sure that I agree with the post's premise. As with WordPress, a .org is entirely appropriate for bbPress. WordPress.com really has very little at all to do with WordPress.org. The .com is actually built on an entirely different application (WPMU) than what is offered on the .org.

Besides, the Automattic-run service based on bbPress is significantly different from the Automattic-run service based on WordPress.

In the latter's case, the symmetry in self-install versus hosted-install domains broadens the reach of the hosted-install domain. In the former's case, the hosted-install domain is targeted at such a precise, niche demographic that it can handle having an asymmetric domain name.

All that said, would it be nice for Automattic to own the bbPress.com domain? Well, sure. I don't know what they'd use it for (maybe even just a redirect), but of course, it would be nice.