That is not the end game because small companies, startups, etc. are more efficient than big ones and have no ingrained culture that prevents innovation.
Eventually some of those small companies become inefficient big companies. We see this struggle recently in the news, with the CEOs of Facebook and Google talking about how they need to become more efficient, maybe certain people shouldn't be there, etc. -- they got big when times were good and now they struggle with the inevitable consequences of bigness.
This has happened many times. Nobody saw Microsoft coming in the 1970s to dethrone IBM. Microsoft didn't see Google coming and still can't beat them on search, they didn't see AWS coming and is catching up on cloud years later, etc. Most of the automotive industry thought Tesla could not scale and would go out of business years ago.