No kidding! That documentary would fit perfectly with the original, but with the CG ridden DC, it is a complete joke. That might be a really good point to bring up with Warner.
The funny thing is, most people would only be interested in THX1138 for its historical significance anyway, and would be watching it out of curiosity. I have heard only a few people say they really enjoy it as a film and watch it from time to time for pleasure. This makes it even more outrageous.
The whole thing is a bit like making a documentary about ancient Roman culture, and interviewing modern Romans and asking them about the way they live.
Imagine a tour guide in a museum explaining how all the artifacts from ancient cultures have not only been restored to represent their original form, but have now also been tweaked and souped up to better match modern trends in style.
"On your left, we have a classic indie film from the 70s. Notice its state of the art special effects? These would have been quite impressive by 1970s standards, and were of course, added many years later and have nothing indie about them. This particular indie film maker became very successful and very obsessed with special effects..."
I often wonder if Goerge "We must preserve our national heritage" Lucas realizes how ridiculous all this is? For some reason, I think he probably does't...