You can forget every word he said in that interview.
What he really said was "When I didn't get the contract I wanted/earned (you decide based on your perspective) & the Steelers gave Antonio Brown the big money contract, my agent & decided to play out the last year of my contract without causing too much trouble, but certainly not looking to put myself on the line for a team that doesn't value me the way I value myself".
Wallace is probably not as good as he thinks he is, but is likely better than a lot of us say he is. He'll be hard to replace.
Overall, those 13 catches for 94 yards over the last four games are not going to be too difficult to replace, IMO...