The special thing about this Key Directory, is that
whatever is written in the directory can never be
modified, that is, it's impossible to modify anything from
there without having to bring the service down, or telling
to everyone that's looking about what is being modified.
The MIT PGP key server has eleven different keys in my name which I created in 1997, when I was about 12 years old. Of course, I have long since lost the private keys and e-mail addresses.
I guess with this proposal, the fact you used to go by benstillerfaggot69@verizon.net will be part of your permanent record.
Unless I missed a part of it, the key is only permanently tied to the email address - i.e. you could always say that benstillerfaggot69@verizon.net is a different Joe Bloggs and not you (probably only plausible if you have a common to medium rarity name though).
I guess with this proposal, the fact you used to go by benstillerfaggot69@verizon.net will be part of your permanent record.