Indian Takeaway
The Digi Yatra facial ID system is being rolled out at Indian airports and though it does not eliminate a boarding pass as reported by the Financial Times, it does eliminate the need to corroborate identities at the gate prior boarding. Users are required to upload a selfie, yet in one survey 30% of them did so without knowing what they were signing up for... which critics suggest is the means by which they could be tracked everywhere and anywhere by the government.
My takeaway from this is that to implement a system that involves recognising other people whom you might know ideally involves uploads of the same kind to assemble a bespoke database. Whether it will happen in my lifetime, or indeed at all, is debatable.
Unless.