It's possible that you did not understand the original article. Or perhaps you did not read it. When you write:
"Each technology lowered the cost of starting and running businesses"
No, not in those industries. When an industry consolidates, the cost of the starting a new business in that industry skyrockets. Eventually it becomes impossible to start a new company in that industry. That clearly happened for trains and automobiles, microprocessors, and certainly now for Internet companies.
This is a pat re-statement of a tired cliche:
"They all spawned brand new ecosystems that created entirely new opportunities for entrepreneurs to create wealth."
There will probably be economic growth in the future. I mentioned one obvious industry that is still forming: genetic engineering. That doesn't change the fact that the gold rush has come to an end for Internet startups.
Here you are changing the subject:
"The train even unified some nation states that didn't exist."
I come back to my original diagnosis: Your comment sounds like pure denial. You don't want to face a painful truth, so you create a rationalization.
