Before speculating about what comes next, it is good to know what was before and what we have now.
I am familiar with Mr. Rifkin's writings, and he is not good at that.
I am not good at speculating what might be next, but I can help with what we have.
On Medium, one can find my article explaining the differences between capitalism, socialism, and communism https://virtualagora.us/capitalism-socialism-and-communism-db09ad64b81d.
Despite Mr. Rifkin's theory, I see that our only practical choice is between capitalism and socialism. My lengthy essay on that matter is on Medium as well, https://virtualagora.us/capitalism-versus-socialism-9ece51b5ff29.