Honestly this was such a good ending, I'd rather have a reboot than a sequel where Bruce goes back to being Batman (or especially a retcon where the end of this film never happened).
Plus, if their goal is to do a Justice League movie, they need to set up a Batman who can believably fight along side Superman, Wonder Woman, Flash and Green Lantern. Bale's Batman showed hints of this in DKR, but overall, he's not especially adept at fighting or smart. He needs to be both of those things if he's to make sense in the JL.
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