That is an excellent question.
Under the assumption that the GOP as it was once known has been infiltrated, fragmented and destroyed my guess is that it will not find its way. The GOP isn't what it was or might have been and it ain't coming back soon, if ever.
Most of the good people, the real Republicans, have left office. What remains are old self-serving white male corporatists, political dregs, opportunists, ideologues, a semi organized mob of racists, bigots and dominionists. It is their voice, not the voice of real Republicans, that we will hear. Their platform will be about economic hope and social and international fear. It will be about throwing bones to the extreme right religionists. It will be about isolationism. It will be about protectionism. It will be the standard tired old white guy drivel they have been saying for a while now.