I remember reading years ago about the Golden Age that is called "Satya Yuga" in the Hindu spiritual tradition or the age of the truth, but I imagined it as being more of a souls transformation era rather than a technological one.
Now with all the progress that humanity has already made that you mention in your post I start to think that there can't be no spiritual growth without the external growth. Once we evolve everything around us changes. Even the environment. At the same time is very important to be a part and embrace the opportunities of blockchain, free energy and AI have to offer. AI scares me a bit I have to say, but having robots as surgeons with the help of AI is a an important step for humanity. Last thing before becoming too boring I want to point that first that came to my mind when you wrote about the exponential technology growth was the golden ratio of Fibonacci that describes very well what you are pointing at in this topic.