The most interesting of the ideas, and the one that fits the current story arc best for me is the Batman being hunted by another hero or heroes. There is plenty of opportunity in that storyline to introduce morality and difficult choices, as well as upping the difficulty for Batman as he tries to stop other villains while being hunted down. Also, having chosen his current vigilante guise, he would be unwilling to do to much harm to the hero hunting him as he would understand why they would come for him. The current role he has chosen for himself is almost designed to draw out that hero, one that Gotham could be proud to have and possibly replace Dent as their "White Knight."
As far as Robin, my understanding of Bruce's wishes in the films aren't that he hopes someone will replace him as a masked vigilante so he won't have to do it forever, but that when the right person comes along to lead Gotham in the right direction, his role of vigilante/protector won't be needed any longer, and he can retire to a normal life and not need to be replaced.
As long as Nolan avoids Robin or Batgirl, I'll be happy.
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