A bit of overreaction for sure. Ehlers got 15:26 yesterday. Not out of the ordinary for him, if you look at his game logs. Prior to that he was on a 3-game point streak, putting up 5 points and he logged 20:27 the night before.
It's possible to color this in two very different ways. One, you could theorize that he was moved in order to try to spark another line. Two, you could theorize was being demoted because the coach saw something he didn't like . Whichever one you choose will be influenced by the outcome on the score board. Chances are if that second Buffalo goal doesn't happen in the 3rd, and the Jets happen to bounce one in to win this game, no one would even mention Ehlers' 15:26 and the idea that he is being floated out to be traded.
I will grant however, that I was surprised to see Copp out there in the EN situation instead of him.