T3 was entertaining, but T2 had was could virtually be called a perfect ending. I guess if you wanted to, you could just ignore the other sequels, but with what we have, I do want a T4 and I don't think it's going to really be about terminators so much as that future was that's been built up so much. Therefore, I doubt a character for Arnold would have much place. I do like the idea of the cameo though, for old time's sake. I just hope we don't have wait and wait and wait for this next one.