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I think Nolan threw in the "You should use your full name... Robin" as just a bonus to fans. This film played fast-and-loose with the Batman canon. "Robin" is fully grown and a police officer, sharing only an orphan background with Wayne/Grayson (no silly carnival/acrobat crappola). The ending simply affirms, if this is the end of the road for Nolan/Bale, that the idea of Batman will live on (hence the rebuilt Batsignal telling Gordon that Wayne's alive, providing a beacon to scare criminals, AND summon the possible "new" Batman). Does JGL become Batman #2? Does he become Robin? Does he bypass Robin and immediately become Nightwing? Many possibilities.
As for an "Inception"-like ending, it's pretty clear that it's real. Wayne fixed the autopilot six months ago. The pearls are missing. The whole point of Clean Slate is the ability to erase your past (which both Catwoman and Batman wanted to do, and did do). I would like to think that, in the future of this version of the Batman word, Batman stays retired and enjoys living again while JGL takes up the job of protecting the city. I mean, he'd already been retired for 8 years, and his body clearly isn't holding up well despite from coming back from the back injury inflicted by Bane.
Also, for those unhappy with the speed of that recovery, note that for time-compression purposes they didn't actually say his back was broken, but that he ultimately had a protruding vertebrae (hence the reason he could rehab in 5 months).
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