The problem (according to Das Kapital ) is that the owning class will fight back. Not all of them. Some realize that long-term capitalism requires keeping the working class happy (more or less) but well more than not. And as we learned with feudalism in the middle ages, it takes only one bad king to bring the ruin the works of ten of his predecessors. (It’s a running theme in A Song of Ice and Fire )
So these recommendations are on the assumption that our governments are not already captured. The point of government is to serve the public good and the US has been trying to go back to that for over a century (since the Great depression, which escalated the desire to try something else, all the while the Soviet Union was doing just that.)
Our plutocrats have more resources by which to keep hold of our current governments, even as industry pollutes the air and drives us toward extinction.