Interesting premise but I don't think DC has the balls to actually do it. In the end it will be firmly established that Damien is Bruce's son. although I think having Damien be Slade's son would be more interesting in the long run, the drama would be insane. Besides I was always under the impression that Damien fans held a low opinion of Bruce. Seeing him as a bad father and some even saying that Dick should try to get custody. But I guess if DC actually pulled the trigger on this it would remove Damien from the Bat family and lessen his exposure and I don't think his fans would like that.