I suspect what'll kill these is the same thing that kill google glass - social ostracisation. It's so, so wildly adversarial to effectively shove a recording device in the face of everyone you're interacting with you might as well wear a emergency orange t-shirt with 'verified asshole' written on it.
Unlike google glass they don't look weird. Unless you know what to look for you will probably just think they are ray bans.
They look like any other pair of sunglasses. No piece of glass over one eye reminding everyone you meet that you’re wearing a camera. They’re incredibly stealthy