For what it is worth, for all of the references of the GOP "going the way of the Whigs", this would be them "going the way of the Federalists/early 18th century Tories".
The single party that emerges always splits in two though or devolves into factionalism then splits in two.
"always splits" is an oversimplification. Democrats may split or may not.
D's have the female vote, the D's won't split into two parties and we are the Majority
Are you seriously saying that a single party is going to hold 100% of the vote and not split at some point?