Well since we've been pelted with dark cynical batman in comics, cartoons and films for the past 20 years why not...
...Brad Bird making a more mature Brave and the Bold type film. Have Bruce Wayne be the "hairy chested sex god" as Grant Morrison loves to put it, a Bondian man's man who gets the woman, save the world and can crack a snarky joke or two (against aliens, ghosts and other weird crap) and has an almost ridiculous level of competency (aka Bat-god) have some sort of grounded element to it (think what they do with the Marvel universe) and you've got yourself a fresh bat-film that is centered less on crushing dark mythos and more on lighter adventure and action (and fun).
That's what I'd like to see personally.