What a ludicrously daft post. If you've "never" seen anyone with a 5c, then you must live in a fucking hole. I see them ALL the time, and next to the 5s, its the most common phone I see. When I was in NY it seemed like every 2nd person had one. So really I don't know what planet you're living on, but if you've never seen a 5c it most certainly isn't earth. That, or you never leave your house. The rest of your post is just as absurd and extreme. The 5c is nowhere near a failure, let alone "one of apple's largest market failures ever". You state it is a FACT that the 5c is a flop, then fail to provide a single fact in your post. Do you even know what a fact is? Your rant is devoid of any.
Is this enough or you need more?
Main reason apart from I have already mentioned? In previous times, Apple would lower the older model's price to 99 USD or so, or exactly what has NOT happened to the 5C, which carried a much higher price tag - and don't even come with the nonsensical excuse that Apple deliberately created another product line just to drive up sales of the 5S - no company is THAT stupid.
Just clear evidence that Cook should have stayed as COO, not CEO.