If they adapt, Hush, one of the greatest DC Comics to date into New 52, then everything within that continuity would be a mess!
In this continuity Tim Drake was never Robin, Barbara Gordon can still walk, and Poison Ivy is a member of The Birds of Prey... So what will happen in Pre-Reboot stories that will be adapted into movies?!
It will completely disregard the previous mythos of said stories and leave anyone watching confused.
Personally I feel the "New 52" was a wasted chance. I personally feel if they wanted to reboot they should of went all out with most notably Batman for example starting off with no robins or just Grayson first then with the 5yr time skip they could of hinted at some robin's being in their. They could of kept stuff like Jason's death and return as Red Hood, but not every story had to stay. Batman and Green Lantern are suppose to have alot of their history kept with them which doesn't make sense with all the tie-ins that does with other heroes and villains who still have yet to appear or don't fit in the timeline. What they technically did was a revamp.