These six 2018 predictions are neither guaranteed, nor particularly prescient. But the best predictor of past behavior, with people and Krugman's cat, is past behavior. So if any, or all, of these predictions happen, we shouldn't be surprised.
The continuing divisive and acrimonious political environment in 2018 America will bring no abatement of the decibel level held throughout 2017. In fact, it's likely to dial-up.