> With a DAO as the nominal owner, selling property simply becomes a matter of executing a smart contract transaction on the blockchain.

Except legally speaking that means nothing unless you go through the legal process of transferring your title.

Sure if governments ran on it, but the cost won't really go away, you will still have taxes, and you will still have lawyers, and you will still have disputes. Smart contracts does not fix the oven that was not working properly when the title was transferred.