Nice, I was going to say Davis. He's an underrated writer with considerable history on Superman, and his work is still so good. His Savage Hulk was something else.
But yeah, I think what would even gauge my interest is seeing how Bendis goes out. But trying to think ahead:
Of all the good friends he has in the wings, I'm most fond of Oeming taking a title. I think David Williams would have a style complimentary to him.
Corinna Bechko amd Gabriel Hardman have a spectacular working chemistry and they've already landed at DC woth Earth One. Very fun and detailed storytelling.
On a list of the likely, I'm actually very fond of James Robinson. He can write for very long periods out of nowhere with a very solid grasp on the components that make superhero stories work. It would be great of him to bring his Invaders artist, Steve Pugh, back to DC. He's even better now than he was back in Superman vs Terminator.
Keith Champagne did a good and quick fill in story not long ago. I'd be open to seeing him continue the Action Comics direction with Jack Herbert.
Also, I know Hitch and Rob Williams really like the character and would probably take a shot. I would hope they could get someone like Barrows or Fabok, or an up and comer.