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.
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
Have you seen them in the wild? They're notably chunky and have an obvious hole where the lens is. You might not notice it in passing but if someone's talking to you it's hard not to notice. I wonder how many of their owners realise how much they're affecting every interaction they have with another human.
Unlike google glass they don't look weird. Unless you know what to look for you will probably just think they are ray bans.
Maybe in a few generations. Right now they do in fact look weird.