How about one just follows up on Dark Knight Rises and go with Joseph Gordon Levitt?
He's a very good actor, he's established and they heavily hinted at him taking up the suit at the end of the movie and it would tie in Nolan's movies with the greater DC universe.
The only drawback would be that he just isn't Bruce Wayne but if the script is solid i could overlook that.
I agree that Gordon-Levitt deserves the chance especially after the build-up at the conclusion of TDKR.
But Batman's supposed to be tall, dark and imposing. Who's going to look at JGL that way, besides maybe Peter Dinklage?