I actually had high hopes that DC's Showcase format (five hundred-ish pages, line-art only, square-bound) would evolve into a budget anthology format. There's a million angles to work, obviously, but I figured maybe do all the month's Superman-related stories, Batman's, and then pairings of the second-stringers, all the teams, the limited titles and launches (a genuine Showcase), and so forth. And, since it's an anthology, any time you get a prima donna artist who slacks off on his work, you give everybody a "special treat" of a story dusted off from the archives.
Another (more marketing-friendly, consumer-surly) approach would be to headline the flagship characters in as many of the books as possible to get the suckers to buy the entire line to try anything out, and you'd name them after the classic titles. Action Showcase would star Superman, and be backed by the more action-oriented heroes, like the Flash. Detective would be Batman, plus the noir side of the stable. Lather, rinse, repeat.
Either way, basically a gigantic version of the Golden Age, 64-page anthologies. Smarter would be to make it a quasi-social thing, where you get the fans to talk about what worked and what didn't work about each book (heavily moderated), and maybe allow people to submit work for use in upcoming issues.