No, that's just a problem that lives in a different layer of how we organise the world. Right now we haven't decided to operate these centralised things as services provided by society, to society. Right now, they are owned by people who build up heaps of money, which in our current system translates to unwarranted power.

These are choices which can be changed.

Trying to work around the current system via a blockchain is certainly an option. But it's going to be worse in every other way except those externalities. And so they will tend to creep back, and the blockchain will be pushed out.