I'm so glad he hasn't done a six movie set, and I hope he never does. It's for the best that the two trilogies are considered as separate as possible. All a six movie boxset will do is make it too difficult to shake the notion, and, knowing Lucasfilm, it will be impossible to purchase the movies separately for several years... not that I'll buy it at all unless the OOT is on there. Honestly, I'm not even sure I'd buy it if it had that I've purchased these damned things so many times, but it's the only thing that would budge me.