Harras apparently edited the X-Books with an iron fist, so there's that. Personally, I like the guy.
That said, I figure boredom's pretty much the only thing that'll drive Morrison off the Bat-books. Sales aren't going to drop enough, I'd suspect, and they'd almost certainly rather replace ANY editor than Grant, to avoid the firestorm of "editorial interference" protests from the fans of his work.
has actually kind of enjoyed Morrison's work, although Dini's was better.
The idea that DC would put some X-editor on top of Morrison as some kind of attack dog is laughable.