Let me restate my understanding of the article.
With the current IPv4, you trust someone to sell you a box that implements NAT software that blocks outside people from accessing your private machines. If you want outside people to access your stuff, you configure the NAT software to allow a specific connection to go through.
In the future, with IPv6, you will trust someone to sell you a box that implements firewall software tha blocks outside people from accessing your private machines. If you want outside people to access your stuff, you configure the firewall software to allow a specific connection to go through.
I'm reading it the same way as you are... this guy is afraid that switching technology to IPv6 will somehow do away with firewall devices. His misguided point seems to be that because there will be enough IP addresses that NAT and therefore private addressing will not be needed.
Obviously to the author(LOL), the only reason people buy firewalls is for NATing.