if the Internet actually managed to move to v6 the end of NAT and CGNAT would be a huge win.

Also, look at the price of every v4 address you have to rent, and compare it to v6 and tell me there's no return.

I've practically built an entire career out of finding ways for customers to use fewer v4 addresses and the demand is there because v4 addresses are expensive as shit due to their scarcity.