If Cobb is actually in limbo the entire time, what the point of the movie? Obviously there is the explanation of his wife trying to bring him out, or his godfather using his knowledge along with Juno to bring him out. But I suppose, for me, that explanation discredits or makes most of the what we see in the movie way less interesting. The people in it, their motives, the plot of the Japanese guy's company, while all good and well, is pretty much lost (or, as I said, much less important) if the whole thing was a ploy to use Inception on Cobb by some other party.
My question then, is, these writers must have an ulterior motive, as "waking Cobb up" isn't that thrilling. There must be some other aspects of the plot line we see that make it more interesting than it seems to be.....?
Edit: If it's just supposed to be a glimpse into the complexity of epistemology then maybe that's neat?