If regulation is to be attempted, we gotta do it right. Can't leave loopholes around to make things cheaper for them and worse for everybody else. They should have literally no choice but the right one. Waste and chaos don't matter. Do things right or give up.
Letting them keep IPv4 resulted in them dragging their ass, implementing NAT everywhere and killing end-to-end conectivity on the internet, repurposing IPv4 as a reputation system, god knows what else. We gotta get rid of it.