I am sad to see Lehner leave and I am not a fan of giving Varlamov four years. However, if Korn and Greco believe that Varlamov can be better than Lehner with some work, that is good enough for me.
Ultimately, Varlamov needs to be solid for the next couple seasons and help get Sorokin over here and settled in. Then as Sorokin (hopefully) earns more playing time and the No. 1 job, the Isles can re-evaluate Varlamov's role. He could end up being a solid backup, traded (if he is still playing at a high level), lost to Seattle in the expansion draft or a buyout candidate.