Methot is an underrated player. He is exactly the type of dmen teams love to add for the playoffs.
He would be a fantastic fit. Methot-Boyle/Klein is an embarrassment of riches on D. But he will fetch a 2nd +. I definitely see teams competing over his services.
And at the end of the day 3C is still the void the Rangers should expend any trade chips on. Shifting Hayes to wing, and having another capable C in case of injury to Step/Brass should be by far the top priority. Vermette would be perfect, but I would not trade Miller for him. Actually Hanzal would be my top choice but that would almost certainly cost Miller +.
This team is as good as it's been since the mid-90s. This is the window. I am all for win-now trades. But I would argue that Miller is too important this year as bottom-6 wing, and that trading him just really creates another problem - even in a "win now" context.