Well, I mean, "Put unknown creators on your well-known titles and vice-versa" is a pretty friggin' obvious thing to do. People aren't going to stop buying Batman no matter who's writing or drawing it, whereas people might pick up some C-list title because a rockstar's on it.
But that's just not how DC and Marvel work.
I've been saying that for over a decade now and if you really want to get good and frustrated you can go through Christopher Priest's blog archives and see someone (now formerly) inside the industry repeat over and over that the reason his books never sell is because they keep giving him books that already don't sell. (And let me tell you something, that dude's fanbase may be small but it's surprisingly loyal and vocal. Any time you see somebody do an article I'm amazed by the number of people cropping up to say how much they loved his Deadpool/Black Panther/Quantum and Woody/PowerFist/whatever. Imagine how many fans he'd have if they'd given him Spider-Man.)
In their defense, DC and Marvel HAVE done a pretty great job of picking talent out of the indie pool for the past decade plus. Mike Allred is my favorite example from the turn of the century; more recently it's been guys like Lemire and Snyder.
On the other side, there are the cases where they pluck successful writers out of other media. Cornell is a big recent example, and I'm loving China Mieville on Dial H.
Anyhow. Seems like there was another announcement of a new left-field creative team that had me pretty excited but I can't think what it is now; maybe this WAS it. (It wasn't Nocenti on Catwoman, though I think that's a big step in the right direction.)
...Back to Chew: I could write a whole essay on how fucking masterful the sequence with the baseball a couple of months ago played out. I'm not sure what percent of that was Layman and what was Guillory, but it was really some INCREDIBLE fucking sequential storytelling.
Chew is like Venture Brothers in that it makes me laugh like a motherfucker but also realize that these guys could totally kill if they decided they wanted to play the whole thing straight instead.
...so really, while I'm with you on hoping he makes Batman funny, I think he could do a pretty good grim version too.
(Grant's certainly keeping Batman funny.
)