Yeah, except it's not like they're ever gonna redo all that cg in a higher resolution. I doubt they were even considering "hey, should we save the camera negatives for when we can do the effects at an even higher rez than 2K someday?" The processed version of the shots were considered the final version. Lowry will simply remaster TPM someday just as they did the OT. They didn't have the '97 effects shots saved on a computer in '04, Lowry had to restore them just like every other shot on the OT's negatives. If you look closely there's even a little framedrift still there. It will likely be the same situation for TPM. They'll restore it in 1080p to remove dirt, dust and scratches, but there might still be some framedrift and other anomolies. Just as with the OT, they'll never be able to erase some telltale signs that it was shot on film. Even though AOTC and ROTS are forever stuck at 1080p, Lucas probably cares more about the fact that he was able to completely cut film out of the equation.