If he chokes in the PO again over the next couple seasons, no doubt Gruby gets a the nod/door opens for Samsonov.
Holtby wasn't good in some big PO games last year, IMO has not proved squat that he's a pressure goalie as of yet. He has had a great season, great numbers, but he's also got a tonne of support from a great team in front of him which had minimal injury issues to deal with. It all comes down to PO, if he chokes and the team goes down in the 2nd/3rd round this year I'd say he has one more PO to show he can win before someone else gets an opportunity. IMO a top goalie should have no problems getting this years Caps team into the finals at a minimum. Look at Howard, Detroit gave him the big contract and treated him like a god before some poor PO performances now he's all but done-it can happen.
For Samsonov, showed he could deal with pressure in the KHL PO and at the WJC where he was excellent in the QF game against a higher rated opponent. At such a young age, with such talent it only makes Holtby's margin for error over the next few PO very slim.