How would you respond if that were announced?
If I were king for a day,
But you aren't. No one is.
The core requirement for such announcements is that there be a real enforcement arm.
Not necessarily. If you announce that YOU will treat that date as a sunset date for IPv4 and invite other organizations to sign up for the declaration, you might be able to get a movement going. Alice's Restaurant comes to mind as does the Cluetrain Manifesto.
The best that can be done with respect to declaring a IPv4 sunset date is localized pockets of such control.
One could, of course, imagine a federation of such pockets...
That is too top down, and sounds too much like the ITU, a federation of governments. I don't think that would work but a voluntary manifesto that people could sign up to would work. --Michael Dillon