Wallace already proved himself. What more do you need to see? Wallace would be crazy to settle for 3 years at 15 million. With the Steelers or another team, Wallace needs to get as much money as he can while he can.
Wallace proved that he can't beat double teams and he struggles when teams plan to take him out of the game. He vanished in the last half of last season and while he is a good receiver he is far from a complete receiver who deserves Top 3 money. It's really a moot point because the Steelers cap situation will not allow them to pay him anything close to that type of money...not this year or next year.
Playing Fantasy Football does not qualify you to be the in the front office or on the coaching staff of the Pittsburgh Steelers. They are professionals and you are not!