the average Joe won't care or understand what this is all about
I see this mentioned here a lot, but in my experience (I know it's anecdotal), this simply isn't true. I've heard the biggest-non-nerds I know complain about SEisms. I overhear a lot of "I don't understand why they keep fucking around with the movie. It looks so fake." during office discussions with dry climb-the-corporate-ladder types.
I'm just speaking from own experience as well. Unfortunately I've never had that happen. People notice Christensen in Jedi and that's about it. CGI in a 1977 movie doesn't even raise an eyebrow, sadly, and those are the most obvious (and noticeable at first glance) changes.