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Years ago a Canadian journalist called Michelle Landsberg wrote an article on the American political system that stated that there was only one party, the Capitalist Party, and that there were two branches, the Republicans and the Democrats. The tension between the two branches let the American people labor under the useful fiction that they lived in a democracy, while the real outcome was never in doubt.
I don't think that the present system is repairable. The US will gradually be left behind as newer 'Democracy 2.0' nations find their stride. The ruling oligarchy would rather that the country declined than take any meaningful action to modernize it.
The American public will be told that the present system is called 'freedom' though, so no one can oppose it without being destroyed.