Right, that could also end up the case that the IPv4 endpoints become NAT landlords charging extra for all the "4+" traffic that they have to see. We already se

Right, that could also end up the case that the IPv4 endpoints become NAT landlords charging extra for all the "4+" traffic that they have to see. We already see blocks of IPv4 addresses changing hand for lots of money, imagine if they could also monetize "downstream" traffic. Doesn't that give added economic incentive to never "fix" those bottlenecks? They could encourage more people to support "4+" directly on their devices or they could keep collecting easy rent from being NAT gateways. I have a hard time imagining that profit motives wouldn't make deployment of any "IPv4+" worse than IPv6 deployment.