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Have there ever been any truly revolutionary products on the market that came out of nowhere? Before the iPad there were quite a few attempts at tablets (e.g. Apple Newton) that tested out certain features and got market feedback. The main thing Apple did was to learn from other failures and create an appealing package.

I bet at some point someone will learn from all the attempts at wearable devices and develop something users actually will like. Or maybe we will decide that something like Google Glass simply doesn't work and move on to something else.