Josh, I hesitate to agree because of the backlash that would follow...
...but I would probably buy a 3D version of GWTW, although I would
wonder why the effort would have been done in the first place. Not the
kind of film that I think is 3D conversion material.
Regardless of the backlash, I would agree that a 3D version of GWTW would NOT be a reason to buy it. 3D, except in a few cases, is (has) gone the way of the dodo. Not to beat a dead horse, but I'd much rather the studios use whatever resources they'd use on upconverting an old film to 3D, to restore/release other catalog titles.