Well, we'll probably need to play our backup 5-6 more times at least in the regular season, especially if we want to give Jones any rest at all before the playoffs. Stalock playing those games gives us a significantly lower chance of winning them. Given how tight things are in the Pacific, those extra losses from playing Stalock over potential trade pickup could be the difference in winning the division and getting to watch LA and Anaheim spend the first round beating the crap out of each other, or having to play one of them in the first round and then meet the other in the 2nd.
Will a upgrade to our backup make or break getting to the playoffs? Nope, so I wouldn't say our season hinges on getting one. But how far we go is definitely going to be impacted by seeding, and I'd like the maximum possible chance to win the division. Especially if we can do it for a prospect like Galimov we aren't planning on contributing any time soon, or some later round pick. I'm not saying we should go get Reimer or someone like that to be our backup goalie, but we could absolutely use an upgrade at the position, and it might matter a lot.