> Both parties in America are bad, they know they cannot be replaced because of the two party system

Yes, the Democratic-Republicans and the Federalists know that they cannot be replaced because of the two party system. (Likewise, neither faces the threat of, if it fails to be replaced, being completely re-oriented in a political realignment.) It's not as if, currently, scholars disagree about whether the US is in its Sixth or Seventh Party system -- the two major parties are dominant, stable, and forever unchanging.