Honestly, in the history of American politics, that sort of doom spiral usually leads to the destruction of parties and new ones rising up to replace them. Even as far back as the founding, where the Federalist were destroyed and it was decades of near uncontested Democratic-Republican Party rule because the Federalist destroyed themselves by being so anti-DRP that they openly and vocally sided with the British in the War of 1812.
Honestly, in the history of American politics, that sort of doom spiral usually leads to the destruction of parties and new ones rising up to replace them. Even as far back as the founding, where the Federalist were destroyed and it was decades of near uncontested Democratic-Republican Party rule because the Federalist destroyed themselves by being so anti-DRP that they openly and vocally sided with the British in the War of 1812.