2012? That is 6 years after the IAB workshop in AMS, and almost 20 years (depending on how you count) since the events that resulted in the IPNg process. That said, implementations, if they don't start before the specs reach RFC status, will require something like another two more years to develop hardware, plus whatever it takes to do software development, dev testing, field testing, ...Now you're talking something (conservatively) like 2015-2018.
And let's be realistic here, implementation experience *always* results in spec changes. I have never seen it otherwise.
That is, if the there is any traction to a proposal. There are cases of no spec changes for things no one had implemented, but that means the technology is irrelevant.
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