Thanks for sharing your thoughts. I am understanding "representative voting" as something like the European System where if your party gets 5 percent of the votes is gets five percent of the seats. I think Americans would struggle with that because the idea is that a representative represents certain people in a given geographic area.
I have been racking my brain about past third parties. The Dixiecrats won seats in Congress and electoral votes between 1945 and 1970. The Populists won seats in the late nineteenth century. The trouble is our constitutional system is rigged for two parties. When third parties start attracting voters one of the parties moves in their direction to reel them back in. Hopefully the expansion of ranked choice voting will help new parties to expand.