I think the base line up of non Batman books that DC should be able to keep up going permanently are the following (I counting BoP and RHatO as Batbooks):
Team Books
- Justice League (most of the Big 6, with 2-3 other established Heroes)
- Justice League Dark
- Justice Society
- Suicide Squad
- Titans (based around Fab 5 and NTT characters)
- Young Justice (based around the YJ4)
- Teen Titans/Super Sons (Damian, Jon, Emiko and other younger charcters)
Solo Books
- Superman (staring Clark)
- Action Comics (also staring Clark)
- Wonder Woman
- Green Lantern (probably staring Hal)
- Flash
- Aquaman
- Green Arrow
- Deathstroke
- Harley Quinn
If those are covered I think for the rest of the line up you just have to go for the most interesting pitches.