The only reason why I would let Evans go is to land a proper 2C (by means of a packaged deal). Otherwise, sign him as the lasting veteran presence on the bottom 6 as Dvorak, Armia, Anderson and Gallagher are on their way out.
They can't all be solely replaced by our prospects. We still need some veteran presence. None of the other four will help to land you a 2C.
Laine is no lock either. We could find ourselves quite depleted and we cannot wager on our prospects to fit all these roles, and even less from the market, UFA specifically.