Predator was the shit.It was favorite Arnold movie of all time.

And I agree with Tha Q.

The Rock in T4 wouldn't work.(Assuming that his role would be as a robot)
Simply because he isn't good enough to pull of something like that.Playing the role of a terminator reqiures a lot of talent.You'd have to make the audience believe that your not human.That your an actual machine.

The Rock didn't even do so good playing a normal guy in Walking Tall.So how can he play a robot?

Vin Deisel might do all right.But I'm not entirely sure if he can pull it off neither.
I think they outta pick someone else.