The producers of the fourth Terminator movie dismissed rumors that Arnold Schwarzenegger would put in an appearance in the film months ago, but now Arnie himself is stirring them up again. He told a reporter that he hasn't had any talks with anybody, but he's really interested in appearing in T4, as long as it's shot in California. There are so many reasons why this would be a really, really bad idea.
Let's leave aside the fact that Arnie is kind of old to play a super-cyborg from the future. The fact that he's had so much plastic surgery could be a plus, since his face now looks completely artificial and unreal. But he also bears very little resemblance to the character he played in the original Terminator, and why would the machines create two slightly different models of cyborg? Why wouldn't each model be totally different?
Plus there's the fact that Arnie would either have a cameo — which would most likely be shoehorned in — or the whole movie would be rewritten around him instead of Christian Bale and Sam Worthington. I'd much rather have the film revolve around the human characters this time around.
But the main reason I hope Arnie was misquoted, or ends up not being in the movie for some reason, is because the Terminator franchise has moved on. It's no longer just a starring vehicle for Arnie, thanks to the moderately successful TV show. I'd really like to see the next movie continue that trend, because it's a more interesting universe if it doesn't all revolve around Ahhnuld. Plus I already see enough of him as my governor.