All of the best practices seem to be in place in the consumer space. Several major consumer ISPs (mobile carriers) are IPv6-only and there hasn't been that much

All of the best practices seem to be in place in the consumer space. Several major consumer ISPs (mobile carriers) are IPv6-only and there hasn't been that much trouble. iOS requires IPv6 support in App Store certification because of this. The trouble is definitely corporate networks. Changing opinions is hard, especially when network engineers have sunk cost fallacies and bad security training to worry about. Probably the only thing that's going to start making a difference for corporate networks is to let IPv4 costs continue to increase until enough corporate accountants start to notice that in financial reports and start to ask hard questions. Too bad there's no easy way to associate a market cost to 10.0.0.0/8 somehow.