In all likelihood, yes -I think a lot of you are placing more faith in the self-corrective capacities of the GOP than they deserve. They aren't going to nominate someone with cross-party or cross-ideological appeal in 2020 -they are going to double down with the Tea Party and pick either Ted Cruz or Tim Scott, either of whom will go down in flames. Plus, Hillary as an incumbent would be an even more formidable candidate than she is now, with a governing record behind her.
This. I really think Hillary is going to blow some minds in her first term. Obviously there's no way to be 100% sure but I think she's going to be able to get a lot of things done and with a strong economy and (hopefully) stability on the foreign policy front, she should be reelected by a wide margin, assuming the GOP coronates Cruz as their standard bearer