Ziz said:
Or another Cromartie when they least expect it. Back in 1990 people (general audience, not fans) couldn't figure out how Arnold could come back for T2.

Although Cromartie's likeness was not an actual Terminator design like Arnold was. Remember, he lost all his flesh and had to regrow it, then he had to have a plastic surgeon make him look the way he did. So I cannot see them replacing him with a robot played by the same actor. I'll miss Cromartie, I was beginning to grow attached.