Yes, it seems states are settling into place. They are less volatile than they were 20 or so years ago. Not many states seem to cross over ground zero any more.
An interesting point, your list shows Minnesota and Wisconsin in the same place in 2016. Funny, because far more people are paying attention to Wisconsin than Minnesota.
We continue to see where the Democrat's advantage comes from: the massive swath of weak Democratic states, which the Republicans, on the other side, severely lack (they only have Ohio, Florida, and North Carolina).
Just a small mistake. In the map you have put Vermont as a super strong Republican state, rather than a Democratic one. 
There's something to be said for the lack of competitive states these days. With all things being equal, I could name about 22 battleground states, but with the way elections usually end up only a few come to mind; NH, PA, VA, FL, OH, WI, IA, CO, NV, and maybe MN. If all things are equal between candidates, fundraising, the nature of the times, and voter turnout, then we could look at NC, MO, GA, IN, MT, DE, ME, NJ, MI, WA, OR, NM.
