A lot of people I've seen seem to hope that somehow Trump will vanish or decide he's had it and Pence will be the candidate. I think Pence would win, frankly. But Trump's ego would never let him do that, nor would it let him sit back and allow Pence to run things if trump did get elected. So I don't see a solution to Trump, since the GOP is unwilling to act.
Personally, I think Hillary will have a "health crisis" or something that allows her to step down, since even liberal panels and analysts are aghast at her security behavior and lies and I don't think even the Dem party will defend her. I think the Dem candidate will be Kaine, and I think he'll have no trouble winning if ours is Trump.