First of all, kudos to Jelmer Vernooij for writing a great article and also for contributing to bzr and other projects.
To be honest, however, I think it would be a good thing for bzr to ride off into the sunset. I think most developers don't have time to master all of bazaar, mercurial, darcs, BitKeeper, arch, monotone, and git. You kind of have to pick one or two to focus on, and it looks like the community has made its choice.
I think everyone pretty much agrees that git has a lot of abilities that the other systems don't-- for example, the ability to handle big repositories without grinding to a halt. In contrast, the only thing that's ever been pointed out as an advantage of the other systems is a "better UI." I have the feeling that in a lot of cases "it has a better UI" is code for "I was exposed to it first."
With regard to the a-word, continuing to use a legacy system can mean "abandoning" the wider developer community, and that's far more important than any individual project.