Over the last 8 years, I have convinced several large organizations to enable an IPv6 only network, disabling IPv4 completely. The result has been a lower cost of managing the networks, as compared to organizations running dual-stack environments. Another major benefit is mitigating a vast amount of malware, command and controls channels (C&C), and Remote Access Trojans (RATS), lowering the number and cost of compromises.
It now seems others are beginning to think about these issues, according to an article from Government Computer News (GCN). It looks like Steve Pirzchalski, IPv6 program manager for the Veterans Affairs (VA) Department, gets it.