I rather look at it from the other direction - but it comes out the same: If there is a technical gadget that really excites me, stop developing it immediately. It won't catch on. Most prominent example: google glasses.
@entreprecariat@es0mhi One I got wrong was wireless ear plugs. I remember when the first generation of BlueTooth headsets came out in the 00s. In the states, a middle aged guy with a nokia in a holster on their belt and the plastic thing in their ear was known as a "BlueTooth Douche". I assumed it would be similar but I underestimated the power of Apple's white headphones as a symbol of white middle class status.