Bob Ford says they should:

Teams do what they have to do, however. When you look at it carefully, the Phillies almost have to trade Utley. It just makes sense. The sooner they do it, the better they can make out in the deal. A three-month rental costs more than a two-month rental, meaning that waiting for the non-waiver trade deadline doesn’t really benefit the Phillies.

So, if it happens, it could be any day. It could be tomorrow. And just like that, a whole lot of yesterdays will disappear. He might not even say good-bye. He might just nod.

Now if you’ll excuse me, I have to find a way to get these tears out of my Crispix.