Exactly. If they can dump Trump after two years, they'll be anticipating that Pence will run twice. Where Trump lacks any intellectual or moral convictions of any kind, Pence is the real deal: a right wing extremist, an ideologue who trades in the culture wars, especially gay bashing. He once enjoyed a reputation for personal integrity, but by shilling for Trump he's squandered that reputation -- which won't matter in the least to his fellow right wingers.
Trump is obviously a fascist and dangerously unstable.  I think the best strategy for those who recognize that is to do everything possible to contain and minimize the damage he will do over the next two years, and then work hard to deprive him of the Republican majorities in the 2018 election; then, in 2020, the voters can return both Trump and Pence to private life. There is no doubt that Trump is going to harm millions of people. We need to do what we can to restrain him.