Our friends at the Institute for Prospective Technological Studies (IPTS) published a report coming to the same conclusion: that a prerequisite for achieving unlinkability of actions at the application level is support of anonymity by the network. So, there are many good reasons for having infrastructure that provides anonymity. That’s not the same
Anonymity sounds attractive: after all, who wants their boss to know which web sites they’ve been visiting or the department of health to know that they’ve been looking at fast food advertisements. And there are certainly cases where anonymity is critical, not only for political dissidents. Look at the often-discussed example of a whistle-blowing nurse in a hospital. But people generally want anonymity for themselves, not for drug-dealing nazi child pornographers. Therefore people won’t accept anonymous infrastructure: they expect "the authorities" to be able to track down miscreants. This is another restatement of the fundamental problem that we have previously discussed as the chat-room paradox.
So if people don’t want anonymity for other people, but do want it for themselves, then some form of conditional anonymity, pseudonymity or escrow must form the only acceptable compromise. Therefore digital identity policy for the mass market (for, as an obvious example, national identity management schemes) must be largely about which of these alternative to "absonymity" (I know, it’s not a real word, I made it up) is to be implemented and how. An immediate challenge to this view is that the general public would find it too confusing, but I’m not so sure. Interacting under assumed names may seem odd to older persons (although they would presumably understand privacy issues) but the the new generation of consumers, it seems natural: I remember at one of the first Digital Identity Forums, Steve Bowbrick gave a very good talk on how teenagers were using multiple e-mail addresses to segment between school life, home life, friends life and so on. To them, pseduonymity is the natural state online interaction, isn’t it?
My opinions are my own (I think) and are presented solely in my capacity as an interested member of the general public. [posted with ecto]