Thanks to http://qa.ubuntuwire.com/ftbfs/ it is easy to find out the build status of packages for multiple releases. In order to make sense of the number of build failures over a series of releases, you need to look at failure rates on a per architecture basis. So I made a chart:
In broad terms it looks to me like we have made progress, but that the curve is flattening out. It’s nice to see though that we don’t have the same “release after LTS” bump that we had in Intrepid. Notice the “*” next to Maverick. That’s because it’s not done yet. There is almost another full week to get Universe/Multiverse FTBFS fixes in, so let’s see if we can knock this down even further.