Trade Anonymity for security? The very idea sounds like trading liberty for security. Not everyone lives in a free-ish country.
Anonymity is key for using the internet in the promulgation of freedom. The democratic nature of its communications is not the 'killer app' as classically defined, but it is the paradigm shift that comes along for the ride as national telecoms shifted to ubiquitous IP transport for POTS.
I'll take my spam and the other bullshit as the cost of this breakthrough. I'm not interested in a effective online network to pay my bills, or wank my thang as a fat westerner who has the right to disagree with their government already. Besides, there's plenty of efficient software to deal with this issue.
Now, if a government/conspiracy/interest group wanted to end net neutrality and free speech of the internet, I'd start going after the software that lets us effectively deal with the chaff, like BrightMail, and other AV/Anti-Phish research in general.
That all being said, whatever they TRY to engineer, it will break down in the end. It's like DRM, we can beat it, it would just be an arms race, and a complete waste of resources. Such reinvention that seeks the promise of 100% security will just serve to further criminalize those who need their anonymity to pursue their free speech rights. And require more technical expertise to successfully execute.
David Akin: If you build a new Internet and you want me to get a license to drive on it, sorry. I'm hanging out here in v.1."
Really David? you think that various forces wouldn't shut down v.1, not especially quick in non-free regions? Those people understand what a threat free mass communication is to their stranglehold on power. THAT is their business.