To me, the biggest problem with the double whammy suspensions of Browner and Sherman is that both players will miss games at the same time, forcing us to start our #3 and #4 corners for four games. Given the way Trufant has played lately, that's a pretty big deal, because he's been getting burned on a regular basis. Thurmond on the other hand is coming back from injury and you would assume he wouldn't be 100% up to speed, but the last time he played for us, he looked very promising.
If we kept one of Sherman/Browner while starting him across from Thurmond while keeping Trufant in nickle only situations, then our secondary wouldn't actually be hurt very much. The cost of losing one of Sherman/Browner for 8 games is a lot less devastating than losing both for 4 games, especially when your team is in the middle of a tight wildcard race.
So here's a thought- after the Chicago game have Browner agree to serve his suspension immediately, which would take him out for the rest of the regular season, but would clear him for the start of 2013. Then have Richard Sherman aggressively pursue the appeal process (which he is already doing) and try to have the case pushed into the offseason. In a worst case scenario, Sherman would miss the first four of next season, but we'd never have fewer than two good starting corners in any of those games (barring injury). There is also a chance that Sherman could win his appeal over the long offseason, which gives added incentive for him to fight it.
I don't know if that's exactly how things will go down, but if you ask me, that's the smartest way to approach this problem.