AB and Mike Wallace aren't even in the same universe, and as pointed out before, we don't have someone on the roster right now that's prime to breakout into superstar stature like AB was. People forget that we had Wallace AND Brown for 3 years togethere, and it was Brown's second year where he made his impact felt. An 1,100 yard receiving season to go along with 1,000 return yards. We don't have anything close to that right now (mostly because we can't count on Bryant).
AB is going to get paid, and he is going to get paid by the Steelers. They aren't going to trade him, the FO isn't sick of his "antics" (which are completely blown out of proportion by the media and the fans), and he is at the top of his position. His "down" year had him over 100 catches for the FOURTH straight year (only one other WR has ever done that) which was 2nd in the league and he didn't even play the last game, he was 5th in the league in receiving yards at 1,200 yards, and 2nd in the league with 12 receiving TD's... I'll take that down year, especially since he did ALL of that with no clear #2 on the roster the entire season.
Keep downplaying AB's importance to the team all you want, "oh he only touches the ball 5-12 times a game", but he influences the other 60 offensive plays during the game when he's on the field as well. Look at what NE did to take him out of the game, you think that doesn't effect the others on the field at all? If we had Bryant, or a healthy Bell for the entire AFCCG, it might have turned into a shootout because of all the attention they gave to AB.
He is worth every penny of what they are going to pay him, especially since he has out performed his current contract by unmeasurable amounts.