Only if the Republicans nominate someone who can actually win. Clinton's low favorability numbers make her a fairly weak general election candidate, so they could have had this election in the bag if they had nominated Kasich. Instead, they picked one of the worst possible candidates to face Clinton. Can they win in 2020? If the Republican party can get its act together and nominate someone with broader appeal, then yes. If they nominate someone like Cruz, probably not.
Also, it depends on whether or not there is a recession during Clinton's first term and how she handles it. It really is hard to tell right now. If I had to give an answer, I would say that she will not get reelected.
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