Cant agree with this, why would Apple change the iPhone when they hope the design will become iconic, something that instantly says "iPhone". Yes, Porche change the shape of the Carrera, but not to the point where it isn't instantly recognised for what it is.
Apple are going with refinements to the current phone, making it lighter, thinner, stronger easier to manufacture etc. Remember that they're fighting tooth and nail in the courts to prevent copyists from plagiarising their current designs, because they see that design as a way to differentiate the iPhone... If the design changes radically every 12 months, then how will one instantly recognise the iPhone from all the generic crap from the likes of Samesung? Apart from all the legal fees, think of all the marketing dollars they spend establishing the iPhone brand.
Change for the sake of change? Just so it's different from the "old" model? For example, the reason the new MacBook Pro became thinner is because the technology has moved on to allow a thinner design. And regardless of any changes, it still looks like a MacBook! So NO they didn't change the MacBook design just because people got "bored", that would be stupid, and Apple aren't a stupid company.
Nevermind.