Bret - I think one item that we might want to discuss on the list or in a meeting is the criteria for an extension's inclusion in the standard.
Extensions are not subordinate to the standard and play an important role in determining use of features in a way that doesn't impact the core standard as much.
I believe that extensions should be in common use across organizations or use cases (as appropriate) before we consider them for inclusion in the standard. The rationale being that an extension by definition extends the standard for a specific use case that is not yet core to implementing the rest of the standard. This clearly is a balance as several of the features in the core standard could be argued to be in a similar state.
If an extension is in common use and many use cases or organizations feel that it should be part of the core standard then I support its inclusion. Otherwise, I think it's best to leave it as an extension.
Its worth a debate on the extension to core standard inclusion policy or philosophy the TC wants to adopt and it might be worth writing it down so that we can apply it consistently and fairly to all extensions.