The Rock in anything is proof as well. Plus Diesel isn't Terminator-esque, he's "look at me, aren't I cool?". F&F might have been good for him, I never saw it, but he couldn't play a Terminator. The only way I could see him as a Terminator is if he had absolutely no lines in the whole movie and was just a background thing that shot a few people and then got destroyed. Terminator 4 is gonna rot hard anyway if Arnold isn't the main character, so no matter what, we're looking at a waste of time, money, and talent...wait...who's the talent in Terminator 3 besides Arnold? Danes...ha....oh I crack myself up.