Your first point I'm not on board with. There were six first round picks moved last year, two more than once. Duchene, Duchene, Hayes, Trouba, Muzzin, Montour, Kane and O'Reilly. Two were swapped between Arizona and Philadelphia as well. 3 or 4 are definitely above Miller but Muzzin or Montour or even Hayes are not far of in terms of value to me, given contract status.
I'm not expecting a step forward, but if he can put up 40-50 points and play the game I've seen from him in New York and Tampa Bay, I'm satiated. It was an overpayment by a desperate GM, but I don't get how this is as bad as Sutter, or Gudbranson in terms of trades with out even seeing Miller play a game.
As for the lottery pick, I have a hard time believing we don't make the playoffs in both of the next two years. Even without this trade, there should be riots in that case.