Aww, yes. The traditional "most important election of our lifetime" logic.
3rd party candidates currently have a slim chance of winning because weak minded bastards are keeping this duopoly alive. "Vote Blue, no matter who!" "Voting Red Until I’m Dead!" If you want to break the cycle, you have break the cycle. "Hey Doc, it hurts when I do this." "Well then, stop doing that."
Or, you can just keep pushing us to the irreversible tipping point.