For the first, I'd say modern societies didn't scale well themselves, which is what causes many of our issues. We need to scale them down, split them into thousands of smaller communities, with more autonomy.
For the other, that's up for debate. They might just be replaced by misery on the current trajectory too.
I agree with you insofar as modern societies are over centralised. In my view the cure for this has to be more than just political - the economic structure (domination of the economy by big businesses) and technology and other things would also need to change.
For the other, that's up for debate. They might just be replaced by misery on the current trajectory too.