That may be so, but I'd be surprised if The Dark Knight as a title was forced by the stuidos... as it was the first Batman film not called Batman or Batman Something. The Batman films have been similarly suspicious of colons, though (giving rise to the frankly awkward looking Batman Begins), so there's that.
That was a great title. It let you know immediately that the story was starting over again, and it wasn't (thankfully) picking up where Batman and Robin
horribly left off. It was simple, to the point, and gave you a good idea of what to expect (a new beginning/retelling of a classic story). There was nothing more anyone could want.
Well, they're not going to please everyone with Star Trek Into Darkness
, so I guess it is what it is. It just seems vague, though.