Inception QUESTION! WHY was Cobb and Mal in LIMBO in the first place?

I missed the whole backstory on inception/extraction, did Cobb go into Limbo because he didnt discover that he had to die to wake up? Or he just decided not to? And, do you think he was stuck in limbo until the end? I personally believe so, because there is no way he could have just woken up, and that would... show more I missed the whole backstory on inception/extraction, did Cobb go into Limbo because he didnt discover that he had to die to wake up?
Or he just decided not to?

And, do you think he was stuck in limbo until the end?
I personally believe so, because there is no way he could have just woken up, and that would have just defeated the whole purpose of Saito growing old and the whole beginning with the shore...
I don't think the totem was ever going to drop.

Post your thoughts, answers etc. :]
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