"in most other areas the choice is either to use the prevalent centralized infrastructure or to not communicate with others"That's the choice now. But it doesn't have to remain that way in the future.
The problem is that most people are relatively ignorant about technology and its potential for abuse (especially when they don't guard or value their privacy).
Not only is this ignorance not inevitable, but there's every sign that it's decreasing.
People are becoming more technologically savvy, and computer literacy is spreading. Along with this, and with the various media exposes on viruses, identity theft, etc.. people are slowly starting to become more security conscious, bit by bit.
The main thing that's lacking right now is a strong appreciation for privacy and anonymity. This is especially troubling and prevalent among the youth, who are growing up in a world where so many people's lives are on display on Facebook, Twitter, MySpace, etc..
They don't really realize or appreciate how much of what they reveal can come back to haunt them and bite them in the ass in the future: from the potential for stalking, to various abuses of private information by employers, insurers, etc.
But, as more and more people get bitten by these sorts of abuses, I think it's inevitable that a greater appreciation for privacy and anonymity will emerge. It may take some time. But the process can be accelerated with deliberate education campaigns and efforts from people who do understand the value of privacy now.