Other. It'll be a party that rises up that election.
Yeah, while winner-take-all always ultimately results in two party domination, I highly doubt those two parties will always be the Democrats and Republicans, and at some point one of them will go the way of the Whigs.
Thing is that collapsed parties like the Whigs and Federalists fell for specific reasons. It'll take something like a party waffling on a serious issue (like the Whigs on slavery) or a one-party domination over a period of time (like the Democratic Republicans) to cause a new party/system to emerge.
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