How bad will a Trump loss be for the Republican Party and for how long will the damage last? Is it possible that Trump could spell the end of the modern Republican Party?

This is a good summary of the mess the G.O.P. has become:

https://www.quora.com/How-bad-will-a-Trump-loss-be-for-the-Republican-Party-and-for-how-long-will-the-damage-last-Is-it-possible-that-Trump-could-spell-the-end-of-the-modern-Republican-Party/answer/Glenn-R-Anderson?ch=99&share=10442a18&srid=uBhZO