FYI,
according to coach Tomlin, Mendenhall was expected to get some carries in Week 2, but Willie Parker's solid performance changed the plans. In all likelihood, it was probably due to being a very close game and Tomlin did not want to risk a fumble.
Unless you are a Parker owner, I think you can safely drop Mendenhall in shallower (10-team) leagues and those with a small amount of bench spots, especially when bye weeks are here. However, if you are in a deep league with a lot of bench spots, I highly recommend keeping Mendy on your bench "just in case."