[morphing libertarian]

In the future the republican party will disappear or continue to represent moderates.

The “conservative” party will be one of two major parties and the repubs will be a third party.

Then we will accuse you of wasting your vote.

[wideawake]

There is zero historical precedent for your hypothetical.

Under our system, ineffective parties collapse, cease to exist - then new parties form.

In each of the five party systems that the US has gone through, there have always been two parties.

A vote for a third party has always been, and always will be, a wasted vote.