Not likely, it'll be a democrat party and a green party. The republican party, does have a social wing that is quite different from the democrats, its pro-life, its pro-religion, if people can't see a difference between the 2 parties, they will choose the original, and differentiate with the extreme.
The republican party can't abandon a large solid part of its base, for a smaller part of somone elses and hope to win.
I'd call that major progress.