Losing a key player will hurt us badly, but all we can really hope for is that other teams have the same amount of injuries, and I think we have better options than most teams. It would be nice to have some near allstar calliber subs, but I'm not sure any team has that.
I'd be very comfortable with Young in LF full time vs LHPs and RHPs. I'd be very comfortable with any of our 3 catchers behind the plate. I'd be fine with Holt at 2B and Rutledge at 3B. I'm not sure about Hernandez at SS or Travis at 1B, but they probably wouldn't be negative WAR players.
Again, compared to most teams, I think our bench is not just a strength, it is (comparatively speaking) a very strong part of our team.