I'm all for theatrical restoration, but the burn mark, unless I'm mistaken, is something that happened to the film AFTER it had been cut. It was not a part of the filming process, and thus it is not like other "mistakes" like matte lines and such that represent the historical, technological limitations that they were dealing with.
So, since they were not part of the original filming process, I believe a true restoration of Star Wars would not include them. Just my opinion.