"Hmmmm, there's some logic there. So maybe we need an alternate victory condition. I don't like the idea of max tech. What if your alternate victory condition is to kill another human player and take over caretaker duties of his AI? Hmmmm. Have to think about that one. Maybe we will jsut kick you out if your AI is killed and turn your empire over to AI control. That could be interesting."
I think the original victory condition is fine. Except maybe add one more element. If your AI is killed, you can get another AI by killing that race's protector off, and "stealing" it.
Phoenix-D