I was thinking about this a little bit last night, and my current question is the following:
Spoiler: I was thinking about the possibility that Cobb and his wife delve deep into their subconscious and arrive at Limbo, where they seem to age gracefully until he tires of it. He wants to kick back up, but she doesn't so he plants the seed deep inside her subconscious that nothing is real, symbolized by his opening the safe and setting her totem to spin indefinitely. After a while, she is overcome with the same feeling he has, and they begin to withdraw to higher levels. They arrive at a level where he feels they are in reality, but she doesn't - but perhaps they've both lost touch with reality to the point that they can't recognize it. She kicks out - or commits suicide - and he is left with two problems. Guilt that he may have led her to suicide, and doubt that she may have been correct coupled with loneliness for his wife.
IF he was still in his subconscious, he could have developed a mechanism in order to fool himself into releasing his guilt and doubt by creating the entire inception on the kid. While his subconscious defenses lead him to believe he is going in to plant the inception on the mark, he is actually implanting his own inception to let go of his fears and doubt so that when he returns to his original level, still within his own subconscious he is able accept it as reality without his anxiety. Thus, the top spinning at the end - which is still spinning but seems to perhaps totter, might symbolize the fact that he has the choice to accept this level of consciousness as reality or to reject it - with the overall message being that we must choose to accept reality or reject it, sensory perception is an illusion, etc.
I'm still playing with interpretations - but thus far that one works for me given the similarity of the ending scene to all of his dreams sequences.
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