IPv4 as a Service such as 464XLAT, will allow them to use less IPv4 public addresses than CGNAT, less costly equipment (or open source) and still provide dual-stack inside the customers networks.
There is nothing from Internet that will not work. I’ve many deployments based on this, and this is the transition mechanism that have more millions of customers, even if compared with all the others together.
Regards,
Jordi
@jordipalet