i think Pence becomes president before the end of the first term
Yup. I also think Pence has good odds of winning in 2020
Mike Pence is the ideology of Donald Trump with an air of fundamentalist Christian piety. He is Gerald Ford without the geniality and capacity for compromise.
Donald Trump is definitely not JFK except for womanizing and Mike Pence is not LBJ... unless America undergoes mass conversion to right-wing Christian Protestant fundamentalism, Mike Pence will offend the sensibilities of too many Americans to win a free and fair election.
We have an even bigger question to ask: will the 2020 elections be free and fair? Or will they be like those of Commie states in which people get to vote but have no meaningful choice?