[orangeboats]

> Forcing them into one stack would have resulted in application developers having to address this or face their software stop working

And what would be your solution for achieving that? Given the distributed nature of the web, it's hard to see how one can force other people to do something. They will just ignore this IPvForced6 just like how they ignored IPv6 (until they see the IPv4 address bills arriving).

Furthermore, "easing the transition to IPv6" isn't plausible IMO no matter how much you do. Just the mere fact that IPv6 addresses are larger than IPv4 addresses already set that in stone, since it necessitates the upgrade of software and hardware - and good luck convincing the programmers and netengs to update those.