Fascinating article! This kind of analysis is why I subscribe to LWN.
To echo the first post, I think this shows the power of Debian's democratic structure. Approaches to fundamental change on the scale of multiarch are always going to be controversial and consensus difficult and slow.
It's unfortunate that Guillem's conscientious approach to dpkg maintainership (and lack of free time) clashed with release goals, but I guess this is the price of striving for release predictability. Maybe it's the "Ubuntu effect".