Should Hillary make a pledge to serve only one term?

[Trapsy]

It's a sacrifice she may have to make in order to retain the WH in 2020. It will already be a realignment period, where the balance of congress will shift. I also wonder if the republican party will repair itself by then. There are so many factors to watch but the only argument for a 2nd term is if some major progress happens in the next four years(which I doubt).