Anytime a government issues a license, whether it be a real estate agent, an attorney, a doctor, or a hair dresser, a third party has to verify that license. With blockchain technology, in theory, the hair dresser's clippers wouldn't function if the license is invalid. That is an extreme example to illustrate my point. Blockchain eliminates the third party. With currency, the third party is a bank. The public ledger validates the exchange just like the public ledger validates a license.

What would the NRA say about validating all gun purchases on a blockchain?

There are thousands of very functional reasons that blockchain will be used outside of Bitcoin. As you start to think about them, they get very scary.

Farmers need to be licensed if they want to use certain fertilizers or pesticides. The criminal justice possibilities are endless.

You wont have to show your drivers license to buy a six pack, just scan your code and go.  

When you think about the immediate response of the blockchain, does that enhance your idea of freedom, or restrict it?