I didn’t realize that OpenIDs derived from wordpress.com is failing to be recognized. Let me to do some exploring and will let you know.

It is a best current practice for Relying Parties to associate multiple OpenIDs with a single account. this way when one OpenID fails for whatever reason users are not locked out of service. In this respect many RPs, including EnThinnai, is defunct.

I also would strongly recommend that you should use OpenID delegation of one of your pages. This way you can maintain the URL of that page to be your OpenID and can change the OpenID provider to maintain full availability.

Is there an extension or successor to OpenID that offers a list of OpenIDs to an OpenID consumer? So that, when my provider is offline or bankrupt or discontinues the service, I can still authenticate as me? still login to my services?

I agree that some RPs will think along the same lines, some may go even further and require physical contact. Of course there will be some who don’t require much. The varied requirement is the reason to separate the authentication function and the service function. This is the fundamental contribution of OpenID.

OpenID only provides the first A in AAA (authentication, authorization and accounting). OpenIDs issued by eBay have more value because they are tied to a valuable trust metric, the feedback (although eBay is shooting itself in the foot with the recently introduced no-seller-feedback policy).