His last win was in mid-December of 2008. Since Quick was called up, Ersberg has lost ten straight. So I don't think anyone can argue that he's "resilient" and "he'll bounce back." At least not from the evidence.
[UPDATE: and here's something else. Take a look at last year's goalie stats sorted by wins. Notice anything? And I mean apart from the fact that the bottom two names on the list are LaBarbera and Ersberg... There isn't a single playoff team whose back-up has a losing record.]