I think they screwed the pooch by not diversifying more. If you want to expand your market, you need to expand your genres and actually market it to people outside the community. No one should be surprised when DC puts out a few non-superhero books, only markets them to their base, and then they don't sell. Big ****ing surprise.
I want a Shazam! book too. Give it to Brian Clevinger. Sold.
I also wouldn't mind seeing a police procedural. GCPD's been done though. I think something based in Flash's city (the name of which eludes me right now) could be pretty fascinating, as could one set in the new take on Metropolis.
As mentioned above, I'd like to see Ba and Moon take on OMAC.
Secret Six
Sarge Steel in a 1940's pulp period piece.
And some sort of space opera would be nice to round everything out.