I find it hard to imagine HBO and CW would have no interest in making a Batman show. They decided Batgirl, Batwoman and Gotham Knights were just too interesting and lucrative to bother with an actual Batman show?
I'm sure they'd both love to have a Batman show, but it's not their decision. As the showrunners say in the quotes you provided, it's DC/Warner Bros. that decides who gets to use which characters, and they make more profit from the Batman feature films than they make from any of their TV series. So it doesn't matter how much the networks would like to make Batman shows -- DC/WB won't let them as long as Batman's still a profitable movie character.