[lcrs]

That's exactly how it's normally done - the offline editor works with low bitrate HD files, then gives the edit list to the online team who re-conform from the full resolution stuff.

There's always an impetus to get higher resolution and quality at the offline stage though, as people get used to improving technology. It wouldn't be outrageous to have a 4k offline now, because people with 4k TVs at home will say "Why can't we? I want to see everything!", even if it doesn't particularly enhance the editor's work.

It would still be done with lower bitrate files, because original 4k material from digital cinema cameras is beyond what most machines are happy with.