An update will never be near as revolutionary as the original, when it was a brand-new product that no one's ever seen before. The same rule applies to everything ever built. I could look at my car, and then a Ferrari, and say "Meh, mine still gets me from point A to point B, it can seat more people, that one just looks different and goes faster, so that's just disappointing.". What people don't seem to get is if you stray from the foundation of a product, it's a whole new product entirely. It wouldn't even be an iPhone anymore if you're expecting it to make breakfast for you in the morning in the next iteration.
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