If Vegas can figure out a way to beat Demko tonight, they're going to make it to the Cup Final again. Hutchinson is not going to get you through a 7 game series against that team.
Now, if Francouz comes back or Grubauer is healthy and able to go, that changes everything, but I'd bet that Vegas would still win.
I don't see either the Islanders or Flyers beating the Lightning at this moment. The Islanders are probably more likely to get it done with their system over the Flyers being overly reliant on Carter Hart to win them games (Hey, AV found his next goalie to lean on and carry him to where he wants to go).