Basics of the reasoning is that a Republican Congress can block everything extreme that Hillary wants to do.
Whereas the author believes that either Trump himself will go far off the Republican reservation working with a likely Democrat Congress, or that the followup blowback to his presidency will deliver an overwhelming super majority to the Democrats.
Not the first time it's been proposed. Quite a few of the #NeverTrump folks are in that camp.
They couldn't stand up to the first Negro Pres, how will they be able to stand up to the First woman Pres