[crazygringo]

Nope. IPv6 still isn't supported everywhere.

When you're running out of addresses, you need a workable solution at the moment.

Not something that requires all networking equipment worldwide to be replaced with a new standard all at once, with is a practical impossibility.

[BenjiWiebe]

It doesn't have to be replaced all at once. Most of it already has been replaced.

[crazygringo]

But it has to be entirely replaced in order to turn off the last NAT, essentially.

Being half-replaced or even mostly-replaced gets you nowhere in terms of NAT removal.