Sure, wpf requirement would be nice from my point of view. I, for one, am not a fan of the shotgunners, but I want the Crossbow, bolts, one-hander, shield to be viable. I don't use it myself, but like mentioned earlier, it's always been a classic.
Lower accuracy on xbows overall and boosting the bonus from wpf could also work. Then again, shotgunners will argue that the crossbow was historically used by people who didn't dedicate themselves to it, but rather as a sidearm for getting some shots away, like it's often being used on the server now. But who really cares? Game balance over realism any day of the week. They could still be able to use it, just with a wider crosshair, or with the sameone, but having invested some wpf in it.