"Extensive use of IPv4 NAT"
It works.
And the more IPv6 was foisted upon us, the more we realized how simple (and therefor robust) IPv4 really was.
The academics can bang their IPv6 drum all they want, the rest of us just want to get doing what we need (or want) to do. And, if the IPv4 boot still fits, why change ?
I am adamant about one thing : I do not want to become a full-fledged administrator just to have my home PC, a few laptops and several mobile phones connected to my Orange box and, therefor, to the Internet. With IPv4, it's a breeze. With all I read about IPv6, it would be a nuisance. And I will do well without having to explain to my wife that her normal web sites don't all work today because somebody did something to the IPv6 connection. No thank you.
So I don't want IPv6. Not before you pry my IPv4 NAT out of my cold, dead hands . . .