I am sorry to be blunt but you seem to be misinformed.
> We need to support the case when a person wakes but-naked in a corn field
DIDs can have a controller, and the controller can be your "real-world" identity... If that is government-issued, you can recover it the same way you recover your identity today in case you lose all your documents. After that, you regain control of all your other DIDs (which you keep to ensure anonimity, e.g. you can have a different DID for each service you sign up with).
> Are any of these EU ID initiatives completely interoperable with the email system? If not, they are useful only for purely official interactions with the government, and solve nothing outside of that realm.
That's plain wrong. It's already possible to use DIDs to sign up with any business you want, though admidetly as the specs are still in flow, there's no much out there other than lots of PoCs - but those already show it's absolutely possible and desirable to use DIDs instead of email addresses... private accounts are an actual liability for most businesses (except those selling your data for marketing purposes, of course).
> Also, because most such ID initiatives are actually X.509 tokens
Where did you get that impression?? There are several DID methods and the most popular so far have nothing to do with X.509 certificates (I think that's what you meant by "token"?). Many are using JWKs (JSON Web Keys) as most alternative solutions do. Check the current registry of DIDs here: https://www.w3.org/TR/did-spec-registries/#did-methods
> We need to support the case when a person wakes but-naked in a corn field
DIDs can have a controller, and the controller can be your "real-world" identity... If that is government-issued, you can recover it the same way you recover your identity today in case you lose all your documents. After that, you regain control of all your other DIDs (which you keep to ensure anonimity, e.g. you can have a different DID for each service you sign up with).
> Are any of these EU ID initiatives completely interoperable with the email system? If not, they are useful only for purely official interactions with the government, and solve nothing outside of that realm.
That's plain wrong. It's already possible to use DIDs to sign up with any business you want, though admidetly as the specs are still in flow, there's no much out there other than lots of PoCs - but those already show it's absolutely possible and desirable to use DIDs instead of email addresses... private accounts are an actual liability for most businesses (except those selling your data for marketing purposes, of course).
> Also, because most such ID initiatives are actually X.509 tokens
Where did you get that impression?? There are several DID methods and the most popular so far have nothing to do with X.509 certificates (I think that's what you meant by "token"?). Many are using JWKs (JSON Web Keys) as most alternative solutions do. Check the current registry of DIDs here: https://www.w3.org/TR/did-spec-registries/#did-methods
The EU seem to be using both Web DIDs (no blockchain) and [EBSI](https://ec.europa.eu/digital-building-blocks/wikis/display/E...) (EU blockchain initiative).