I always consider automation to first target jobs with "trivial decision making." I think trading fits into that, as you can pretty much distill it down to an algorithm. At least as far as I understand it.

Physicians are another great example. A lot of their job today seems to be about translating signs and symptoms and following a decision tree. I'm excited about the opportunities to displace current duties with today's nice to haves, such as physicians who have time to dig deeper into a person's well being than their symptoms that day.