Ah, would that be a Psycho or Jaws discussion by any chance?
Fair points all round, though I was more interested to know what we as fan editors and preservationists should be aiming for (as opposed to what the studios - with all their resources - can potentially provide).
For example, do you agree that an MP4 is comparable to DVD MPEG-2 for SD? Should we still be bothering to burn DVDs when more efficient codecs can yield equivalent (or higher) quality in a smaller file?