Yes, the Citizens United decision was a clear move towards plutocracy. And while congress could pass a law to correct it, it's unclear if they have any inclination to do so, and if the court would let it stand if they did. I agree the health of the US system is poor, but hope that we can still revive it.
Congress won't do it unless people push them to. If these people quit, they won't. Again, who gains from that? Who are the quitters serving, knowingly or not?