The bell end factor
"lengthy time-to-market and lack of a key consumer use case" is to blame for the lack of interest
Snowden and the NSA, a newly found interest in privacy and a growing dislike of having the minutiae of our lives recorded without consent for other peoples jollies might have had a bit to do with it too. Sometimes its more about prevailing sentiment than 'use case'.
It didn't help that wearing it made you look like a bell end either.