There's no leak being discussed. Everyone in the world sets resolving and it is what it is with the current TLDs when ICANN needs more coke money they possibly break every node in the world and a distributed group of thousands has to look if something bad happened.
There is the argument that ICANN should no longer be consulted ever by nodes of consequence but that is an argument that they have failed 100% in their responsibilities.
If you don't care at all about zone delegation and global resolution then you obviously don't have an opinion on how to evaluate ICANNs stewardship of global domain delegation.
We have run out if IPv4 addresses but there is NAT is not a satisfying answer to start. But we have let ICANN polute naming so let's implement shadow naming everywhere is an even less satisfactory answer.