I think if Istvan's vision comes about there will develop parallel societies of people who have opted out of technology: "one day, many of us will use neural prosthetics and brain implants. These brain-to-machine interfaces will likely eventually lead to the hive mind, where everyone can know each other's precise whereabouts and thoughts at all times, because we will all be connected to each other through the cloud. Privacy, broadly thought of as essential to a democratic society, might disappear."
I know that I will never implant a tech device or wear something that "connects me to the hive mind." I'd rather live without all the benefits of 'society' if that is the alternative. I won't let people spy on me or know my thoughts. Without privacy for me there is no quality of life and no freedom.
And what if the technology becomes ubiquitous and sophisticated enough that you don't even need an implant for people and machines to get inside your head? What if it reaches a point where like with circumcision, the parents do it to their children at birth? You assume everyone is going to have a choice here but that isn't a valid assumption.
I will have to align myself with some kind of powerful resistance group who develop anti-brain-tracking technology and who espouse free thoughts in ourselves and our children. If it gets so bad that you can't even resist I'd probably rather not be around.