This is like asking “When will the second coming of the Christ occur?”
IMO, the answer is “The second coming will occur when I awaken and allow the Christ I really am to shine forth and I put into action and live what I’ve been taught.”
Me? I’m still working on it. Even though I know better, I’m still holding onto scars and hurts that I allow to keep me from living in the present moment.
When I finally get my act together, that will be the Second Coming. I think that’s at the heart of Joseph Campbell’s teaching.
What’s the “next” Joseph Campbell or the next Buddha or the next Jesus going to say that hasn’t already been said?