I'm skeptical we'll see Samsonov topping any goalie rankings heading into 2016. Thatcher Demko will probably #1 on lists that omit anyone with NHL experience. If you count guys with limited NHL experience then you also add Hellebuyck, Saros, and Murray into that list. Some may pick Blackwood and/or Gillies over Ilya as well.
Moreover, goalie prospects are notorious unpredictable. Any prospect can have wild swings between now and five years down the road, but goalies in particular are hard to predict. It's why you see so many highly touted goalies flame out and so many starters come from lower rounds (or sometimes undrafted entirely). Looking at the past handful of Vezina winners there were two first round picks (Price, Rask), a 4th (Holtby), a 5th (Miller), a 7th (Lundqvist), a 9th (Thomas), and an undrafted player (Bobrovsky).
I'd much rather invest in the current team than hope Samsonov can challenge Holtby in 4 or 5 years. Holtby is under contract for a while, Grubauer has done well, and Vanecek is progressing nicely. While I won't pretend losing Samsonov would make the goalie pool thin, I'm more than willing to have a thin goalie pool in an effort to get a winger like van Riemsdyk. JVR excels across the board, is young, and is affordable during the current cup window. He is a substantial upgrade over Johansson.
It's quite the opposite of George McPhee-esque. You're obviously referencing the Forsberg trade, but that was highly atypical for McPhee. McPhee would almost always hoard prospects and functioned in a very risk-averse manner. It wasn't until the very end of his tenure he changed that.
