I think you're making a mistake confusing the way things are today in terms of market concentration with the way things were in the past. In terms of market concentration in the US at least, things were massively different even 20 years ago.
I read that as saying there's nothing to be done, monopolies are natural, we can't stop the order of things without making everything worse, we must just acquiesce and learn to live with them.
Is that correct? I have a hard time thinking that is true.
And the point of regulation is to stop it and bring balance. Or are you happy with mono-/oligopolies?