That's patently false. Pun intended. Innovation is not limited to startups. Underneath the hood, there's an absolutely massive amount of r&d and innovation that goes into Intel's chips year on year. Google's progress in machine learning for speech and photos is impressive. The big companies often do very well innovating. Intel producing another innovation that drives a billion dollars of sales isn't as exciting as a startup doing the same, but both are real.
You're talking about the economy in a "Plinko chip" sort of way, and I'm talking about community building. If you want good products and a well paying society, you need to promote more individual nodes rather than giant motherships. And by "promote", I mean actually want it instead of talking about how the rules apply to the current system.
Every time you use the word "growth" to describe "success", you will find that you only have new mouths to feed.