An ideal indicator would be a regular movie or trailer screening where the audience failed to detect a synthetic actor who (who?) played a lead role, or at least had significant screen time during the screening.
There isn't much financial incentive to CGI a human - if they are just acting like a regular human. That's what actors are for.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.