Yeah once they went to 26 from 25, the extra man seems less necessary. But, both the union and the managers/front offices probably want it, and it doesn't cost their owners enough money for them to care.
I would personally like to see it used for a position player occasionally, but in the Phillies' case they only have three eligible players in Wilson, Stubbs and Stevenson, seems unlikely a PH from any of those guys is gonna be needed. Of course a lot of fans - and union members, I bet - probably hoped the 26th man was going to create an extra full-season bench job, not an extra fungible relief spot.