I dunno if it would work. Marty McFly and Doc are two classic characters I doubt any other actor could try to fill their shoes. But the CGI would be awesome.
@MartyMcFly What do you think?
I think all the new tech would make it look worse to be honest. I was just watching Robert Rodriguez' later Director's Chair episode and Robert Zemeckis was his guest and there was just so much practical work that went into that movie. He said it took a week to film the dinner scene in back to the future 2 because they had to shoot Michael in different characters and make sure nothing moved and glue props down and of course there was an earthquake in the middle of it.