I don't hate Moffat. He's a phenomenal writer. I mean, he's known for Doctor Who and Sherlock, but he also wrote the miniseries Jekyll which was genius, and the sitcom Coupling; although, rather sexist, it was still hilarious. The problem is when you're one of just a handful of writers for a show that never stops. Your brain starts to get a bit worn out coming up with impressive material. I see it happen to bands, too. After a nice 2-3 year hiatus they often come back with music that totally trumps everything they've ever done. So, Moffat doesn't have to leave the show completely, but he should seriously take a break.