If Trump drops out there is hardly any time to select a candidate. Plus he will already be locked on the ballot in some states and the GOP would not be able to add their candidate to ballots in many states. Clinton is sure to win. People are listening to much to polls, even when they show her winning, the real prediction lies in the electoral college which favors democrats. That and add in socially conservative older generations dying off being replaced by socially liberal younger generations and it is a recipe for disaster for the GOP. The GOP only wins in midterm elections and because of congressional district gerrymandering.