Gah, the Prequels already looks so irritatingly clean and fake - DNR will only make things worse. I can't say about the OT in BluRay, maybe it will help, maybe not. But the last thing the pristine, plastic-like image of the prequels needs is DNR.

I actually hope someone (in a fan edit, of course) will add grain, speckles and maybe dirt to some of the backgrounds and sets. It would make them far easier on the eye, and more realistic. The Prequels, IMHO, really haven't aged that well as far as CGI goes. :/