Yes, one internet outage and suddenly everybody isn't using digital IDs anyway.
Not that I welcome internet outages, and it was designed to withstand a nuclear war, so it won't be offline very long in terms of the whole thing stopping working.
But, Mandelbrot already proved that any complex communication system based on technology would be only be ever partially operational.
So if that's your idea of complete slavery, it's at worst, part time slavery. From a real world perspective.
I can't see which is more complex, the idea of grays running around putting implants in people for the benefit of those people, without consent, or the idea of people voluntarily being RFID chipped (in order to gain access to certain physical facilities rather than interweb privaleges)..
I had to voluntarily tell Google the other day my month and year of birth just to indicate I was an adult. I wouldn't call that a digital ID so much as an indicator.
Bear in mind, Dick does live in Hawaii. They don't even have a public transportation system there, not having much in the way of industrial scale electrical power generation to keep the thing working.