why reboot it..?? well, cuz, Nolan 'KILLED' him at the end of tdkR. it wouldn't've been a problem, IF he didn't make the Bats NOT doing anything in that 8-year gap (which is really very UN-characteristic for Wayne/Batman) in the first place. i dunno...maybe Ledger's death had a much bigger effect on Nolan (Chris) than he'd care to acknowledge. maybe it just made him lost his way and sloppy in doing this third bat movie of his. and that's a big shame.
i'd say...just CONTINUE the character (nolan's version) AS IF TDKR hasn't happened or won't happen...meaning keep Gary Oldman as Gordon, Freeman as Fox and Caine as Alfr- well...i can see Alfred being recast, if Caine's feeling too old to act already. but, it's really unnecessary to REBOOT the batman, at least for now and the next cupla years.