Not necessarily.

It is mainstream economic and political opinion to regulate in some manner to reduce market consolidation since the 1940s with the Herfindahl–Hirschman Index.

I think necessarily. I don’t think it’s possible to devise a capitalist system that doesn’t devolve into oligarchic control. Markets can’t be regulated like the theory wants, because capitalists just use their wealth to take over the politicians. They are able to do this because they control so much wealth. To prevent this hack, you’d have to take control of capital away from the capitalists, thus defeating the core idea of capitalism.