Funny thing is, the fans taking over the shows for Becky and all that didn't happen til they turned her heel and had her start cutting you people promos, which they then transitioned into a CM Punk fake shoot gimmick.
Brock was doing PPV increases when he first came back in 2012. Who's drawing what now is hard to say, but Becky as the face of SD hasn't increased ratings at all, they've dropped if anything.
Becky main eventing is not going to do anything positive or negative to the subscriptions/ratings. The show doesn't work like that anymore.