Nope. I always viewed the 5c as a supply chain move with two simple objectives -- remove any bottlenecks from the production process, and boost margins. Going from a CNC-machined aluminum shell to molded plastic and stamped steel framing significantly sped up the production, and saved money. Plus, it allowed more CNC-machining capacity to be used for the iPhone 5s launch.
Recall that the iPhone 5 launch was plagued by production yield problems with the aluminum shell. Keeping the iPhone 5, while launching the 5s, would have required a huge increase in machining capacity, and run the risk of supply shortages at launch.
Think about it. Tim Cook is the supply chain genius. Seeing the 5c as a supply chain move totally makes sense. That the 5c could be marketed as a "new" model was just a side benefit.
The measure of how well the 5c did was to compare it to the year-over-year sales of the model that it replaced in Apple's middle price point -- the iPhone 4s. By all accounts, the 5c easily outpaced the 4s on a year-over-year comparison. The tech bloggers eager to stroke themselves after preordaining 5c as a failure, took the obvious lie-by-omission path by comparing the 5c sales with the 5s. Proclaiming the 5c as a failure because it did not outsell the 5s made about as much sense as deeming the 4 a failure because it did not outsell the 4s, or any year-old model because it cannot outsell a brand new model.