LOL, DC is so scared of the thought of any of the other 2 bypassing Barbara on the role, that they do anything in their power to keep them way in any form of media...only they just can't, because in the comics medim at least they sell, and the fans just won't let them go, and they shouldn't.
I mean, just look at the all the trouble they had to retcon Steph into not being on smallville, they went against the creator ideas and forced / shoehorned Barbara on it...lol, its so pathetic that its laughable...