I feel as The Blueprints to making a Great Live Action Movie based on Arkham Asylum have always been available to DC & WB.
I almost don't think it's ever going to happen, Bale didn't do it..Affleck most likely will not either. Burton & Keaton were more than qualified to do it but I think it was a bit early to do it.
It was always a Favorite Scenario of mine, it was made into a Dope Videogame
but that's as close as we'll get apparently. You'll need a Dope Version of The Joker, Harley Quinn and Bane to begin this and WB doesn't have that to pkay it out correctly so I'd rather they not attempt it as it's a Great Storyline along the lines of The Long Halloween, the potential is there but I'd rather no Director go and muck it up.