2016 Michigan to me seems like the Republicans' version of 2008 North Carolina. A bare win during a perfect storm, but where the exact demographic coalition needed to win never manages to manifest itself again for another 3-5 cycles. I suspect it stays healthily to the left of PA and WI
This seems accurate except I don't think it will be that far to the left of PA because I think the first sentence also describes Pennsylvania. No Republican can match what Trump did there and it will probably recede to a 2-3 point Dem state.