I think John is also arguing that he'd like to change the key servers to have some location-based trust.
If people thought it were useful, it'd be something to add, and it needn't be complicated. For example, a keyserver could send signed probe messages with confirmation URLs to all of the addresses associated with the key, and add a signature that says "addresses all responded". For that matter, if a domain wanted to sign its users's keys with postmaster@domain, why not.
Regards, John Levine, johnl@xxxxxxxxx, Taughannock Networks, Trumansburg NY Please consider the environment before reading this e-mail.