Originally Posted by ThePhantasm
Blake wasn't intended to just stay in there as a detective. Bruce repeatedly advises him to "wear a mask" in the movie. Its clear he intends Blake to actually be Batman.
To me, creating another Batman means Batman failed, but it does raise a point raised in TDK, "In Roman times, they would appoint a protector of the city, it wasn't considered a duty, but an honor (or something like that)"