Mad? No. Annoyed yes. Mad just to be mad? No.
But annoyed because Apple is essentially calling the 5c a new phone. It's not. But anytime you tell the Apple fanbase that something is "new", the Apple fanbase automatically equates "new" with "better." And the 5c is NOT better than my iPhone 5.
You can cut it any way you want it, but when Apple introduces a phone at a keynote they are saying it's "new."
And, by the way, I'm not "stuck" on my iPhone 5. I choose to be here. The 5s has nothing for me and going to the 5c is either a crossgrade or a downgrade (I choose the later).
As to what Apple can and can't have, well, whatever. But if I know I am going to be paying a "premium" price for an Apple product I am going to spend my money to get the best of the lot. Why pay premium if you didn't buy the top model?
Ex: My friend way back in 1996 bought his very first car. He was so happy to have a Ford Mustang as the first. But when you looked at it, he rolled off the showroom floor in a base model V6 with plastic hubcaps, manual windows and a cd controller that kept falling off the dash (that the Ford dealer somehow couldn't keep where it belonged).
My point is, if I am going to be paying through the nose for something, I am NOT paying expensive money for less than the top of the line when it's my money to spend.
That's just me. Apple sells to those that are willing to buy less. Hence the 5c.