If Wagner is traded that means the Phillies feel they are out of it. So what difference does it make if Urbina closes and sucks? They won't be going anywhere anyway. They could give the batboy the closers job. Lose by 5 games or 25 games . You still lose.
I have to agree that if Wagner goes, Urbina should go as well. If you are deciding that you are not a contender, which is a prerequsitie to trading Wagner, why would you bother keeping Urbina and letting him walk for no return in the off season?