"Typing IPv6 addresses is much more error-prone than entering IPv4 addresses. This will lead to configuration mistakes and vulnerabilities in routing and security policies."

This argument seems to be a minor issue and probably does not really hold back the introduction of IPv6. But it is a hurdle that has to be taken. The introduction of IPv6 will surely be accelerated when better tools for entering and manipulating IPv6 addresses come available for network configuration and management. This would also eliminate the perception that “IPv6 is difficult and error prone”. As a comparison, difficult security keys have not stopped the introduction of Wifi, and IPv4 addresses themselves are prone to error also.