[irrational]

> replacing all of the old network hardware may just be a project too large to do on a short timescale.

If that is the case, then Amazon should hold off on charging for IPv4 on a short timescale until they have replaced all the old hardware and can support IPv6 internally everywhere.

[JoBrad]

True. But if they are having a problem getting that done, adding a surcharge is a good way to get bottom-up pressure on AWS teams to finish the job.