Adam Williamson's quote does not really do justice to his entire post. For example, the quote is directly preceded by these sentences:
> It seems like what you want is actually not to have three releases at a
> time at all but to have one and update it constantly. And I actually
> rather suspect that would be a model that would work well for Fedora,
> and I'd like to look into adopting it. But it's *not* the model we have
> right now, and it [does] strike me as a bad idea to try and abuse a
> stable release model by pushing admittedly unstable changes into the
> stable releases.
(Obvious typo corrected.)
So in his post he actually says something that differs a lot from what the quote suggests and which is rather more interesting too.