The point with the ending was that batman needed the joker and vice versa. the line was
'this is what happens when an unmovable object hits and unstoppable force' or something
I'm sure the script had it planned so that the joker could always be around if they chose to do a sequel, but then heath died.
They have such a big catalogue of villians they could use im sure they aren't even planning on using the joker in the next 2 sequels.
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