If websites can't trust that their users are authentic they will probably institute even more intrusive checks.
I haven't been optimistic about the future of technology for a while now. :'(
Essentially, the manufacturer of the device + operating system will generate a unique signature per each device, and web browsers will be able to access it.
The real thing is the gating of every kind of information exchange and treatment in the hands of a few entities, that get the power to say who will participate on those activities and doing exactly what.
That is, the complete elimination of the freedom of association and initiative from our society. At least around any one of those that involve computers.
The lost of privacy is a rounding error.