Interesting description and valid reasons why the prequels shouldn't be seen before the originals... there's just no sense in viewing them that way. The only thing I have to take issue with is your mentioning of Sebastian Shaw. Even though it was only a joke, in a world where the PT came first, Shaw wouldn't be a nobody but still a venerated British actor.

EDIT: Whoops. I forgot the logistical problems of that too! Had the original trilogy been made in the last ten years, Sebastian Shaw wouldn't have even been alive to be in it! Same goes for Alec Guiness... well, he could have been in the first one but not the sequels. Hell, the entire cast would have been different since a 50 year old Mark Hamill wouldn't exactly be a fit a naive young farm boy. Oh, and Hayden, who wasn't born yet, couldn't have been Anakin in this fantasy "OT." ^_^