Zombie, you're mistaken about the opening of THX-1138. It's "American Zoetrope," Coppola's company, that you see at the very beginning, not LFL. LFL doesn't own any kind of rights to that movie, WB does. WB actually announced in a transcribed live chat on digitalbits that they were looking at a 2010 blu-ray release for it.
It's the same kind of situation with the first American Graffiti. That's Universal's property.