Indeed, with a making of having, as an "extra feature", a lower bitrate, 3hr of theatrical cut + 1h40 of making of on one disc would have probably saved some space for the TV version. In fact, if they really wanted not to add up a 4th disc, the best idea would have been to split the extra features over a 2-disc TV version.
In the end, I'm a bit sad that Criterion chose not to use a 2nd disc for it, probably to keep the price down. I think we can all agree that a 4 disc edition would have been the most logical, and that we would probably all have paid for the oncost. It is a nice idea from them trying to keep the price point down, but it should never be done by compromising the technical quality of the set.
Now, unfortunately, the set will stay as it is, and it is sad to think that the quality is very unlikely to be better than this, where the TV Version being the most awaited thing from this boxset, and having a clearly non-optimum quality. It is indeed disappointing.
Fortunately, Jerome Soulet from Gaumont said that Gaumont is finally clearing the rights for a French release of the TV Version (likely for 2013), we will see what happens here.