Nikki Haley
This is a total guessing game, but let’s play. First, it depends on who Biden chooses. Then it depends on the results of the election – not just who wins, but the margin. If Biden wins in a blowout, there’s as good a chance as any in our lifetimes that a third party forms w/ Never-Trumpers, genuine conservatives and others who run screaming from the wreckage of the Republican party once finally free of Trump’s yoke. This could lead to a formidable conservative candidate and Haley has to be at the top of that list. If the margin is close, the Republican party remains as is, continues alienating everyone left of Limbaugh, and you have to go w/ Biden’s Veep. If Trump wins (Biden implodes or simply can’t gain any traction doing videos from his basement), then it’s whoever the Dems nominate next from a wide-open field.