Already it is quite clear that we see extremely long waits for the 5S of 5-8 weeks outside the US, which we likely will reach in the US as well once everyone is awake. On the other hand the 5C remains quite available, with just a few days for delivery. Is this now because of limited availability of the 5S or much higher demand compared to the 5 launch?
I still suspect that the 5S will carry the majority of the demand, as it provides a far better value than the 5C:
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TouchID solves a very real user problem, and makes using your iPhone so much better.
I feel that this is the biggest advance in iPhone usability since the Retina display. You are can now have security without the inconvenience.
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A doubling of performance at the same frequency makes the iPhone much more future proof.
I believe that from next year we will start to see much lower annual performance improvements, as the A7 has roughly caught Intel in performance per clock cycle. And they are now only improving at a pace of 10% to 15% per year in performance per cycle. This kind of makes the iPhone 5S the first phone again that you can safely keep for 4 or 5 years before replacing.