A very interesting analysis, but I don't think it works further than the "striking similarities" that Nolan draws to the film making process. If you follow the analogies, what would be the significance of "The Money"(Saito) being shot and dieing, to name just one example.
"Blade Runner" was described as a layer cake by Scott, with lots of different aspects worked in instead of one key "solution"; the same description would fit "Inception", too.
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I don't remember if it was explained clearly in the movie, but how do you get out of the Limbo? If Saito and Cobb don't get a kick, do they have to commit suicide? Does Saito just shoot Cobb and propels him into his dream again, where he sees the kids?