I have no basis to dispute these findings....find them discouraging....

This is what is meant by "winner take all" : Incumbents have huge advantage. 

None of this is to say that Silicon Valley is not important, or that the business innovations coming out of small firms based in San Francisco are an illusion. But writ large, the economy is becoming more sclerotic and favorable to incumbents — not more favorable to lean, hot, “disruptive” businesses, whatever that term might mean.