Not very.
The Oilers are done without Roloson. He wasn't a great goalie, but he was a good goalie playing way over his head, and more importantly, he had the confidence of the previous three rounds to get him through this series. Neither of the Not-So-Dynamic Duo the Oilers are stuck with now are going to be able to handle the pressure of the Stanley Cup Finals, especially coming in ice cold as they are.