I'm not going to respond to most of Jefsey's comments. However, wearing my W3C hat for a moment....*
Thank you for that.
To the extent that W3C specifications are important consumers of language tags, there is interest at W3C and I'm sure the W3C's official liasons will make the W3C's position (assuming that it has one) known at an appropriate time.
??? I am not sure I understand. Every network user application is a consumers of language support. If there is no W3C official position yet, why not to follow under IAB guidance (or to review) the charter I proposed yesterday, in an IETF way everyone could participate, and to have all these applications supported one shot in working on a linguistic ontology where each language instance would be documented by an ad hoc authoritative source. Otherwise it could not be the standard you wish.
jfc
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