The whole world can't migrate all of their hardware on a whim. There was a period of time when it was a very common quip to say that Amazon would have to buy ev

The whole world can't migrate all of their hardware on a whim. There was a period of time when it was a very common quip to say that Amazon would have to buy every new IPv6 compatible router in the world for a year if they wanted to upgrade their infra. I don't know if the urban legend is true or not, but the fact that it sounded plausible is a good enough of an example.