You left out Fabian Nicieza (one of my all time favorites) and Tom DeFalco short runs in Legion Lost, and, as much as it pains me to admit this (As I said, Fabe is a favorite) neither of them did set the book on fire. So, I guess it's not just a matter of new blood, it has to be the right pick for the right book and someone who can write without the editorial interfearence that seems so commun in the new 52.
Peace