In what respect? Mariani was about to get his chance before getting hurt and he was looking decent, plus he contributes on special teams. Every once and a while, Williams makes a decent play. He's lost the rest of the time. He's had chance after chance. If he doesn't look like he can contribute beyond his usual 200-500 yard season, I say he's gone. Three seasons and two with no touchdowns. He has to be on the bubble at this point. I know Williams is supposed to have the upside, but if he's not growing into his potential, you have to let go eventually and make room for someone else, preferably not another Williams.