I see the next 2 weeks as nothing but downside for FWP. If Mendenhall has 50 yards a game, everyone will say OK he played 2 tough defenses..we expected that. If he happens to have a nice game or 2 vs these D's, then I believe the potential for full blow RBBC is there. Only way the next 2 weeks can help FWP's value is if Mendenhall blows assignments left and right and fumbles in each game.
I personally see FWP as a sell (my league is very RB intensive though so I cant bring myself to pull the trigger). His value thus far comes from the fact that he dominates the carries (ie there are no receptions to supplement the rushes), and I only see his workload decreasing going forward. Plus what if he misses time even after the bye week due to the injury (that part is guesswork at best).
I was pleasantly surprised in Week 1 (we all were), but I see a lot of "17 carries for 75 yards with no catches" lines in his future.