I say give this team one more year to win the Cup. It also gives management another year to see where Studnicka and Frederic are in their development and allows them to gauge if they can replace Krejci or not.
I get what you're saying, but it's very rare that the losing team goes back to finals. I went back as far as 1980, and it's happened once, for whatever reason. Teams that have won have gone back, but that's different. The last team to lose, then get back there was the Penguins in 2008 and again in 2009. They lost then won, which again, is an even bigger rarity.
So factoring in the odds of them making a second straight cup run, and the RFAs they have this year and next, I simply see the time to make a bold move as being now. And the most logical move to make, IMO, is to sell Krejci while his value is as high as it will be.