Wally seems to be taking a similar path to Chad Johnson. When Chad came into the league, he looked like he had a chance to be the best WR ever. I've heard Chad admit that he started making more money off the football field and lost focus on football. I'm not sure why Wally's losing focus, but he came on strong initially and looked like he had the promise to be one of the great ones.
Wally never had the length of success that Chad had. He also never has made any significant money on or off the field. But he has lost the focus and the passion for the game just like Chad did. Not sure what Wally's reason is. But he seems to have followed the Chad path at an accelerated rate.