It doesn't enforce anything. People can just transcribe wrong things into blockchains, then have to append patches to the information. Unless you can prove malfeasance nobody is going to lose a license over a mistake. I think you're vastly overestimating how much anyone would care just because blockchains are involved. Notary records are already "forever," no computers required, and there's nothing inherent to blockchains that causes people to type more carefully.

Plus there are lots of situations in real estate law (like ground rent where the freeholder is not identifiable) which don't fit into cute little data structures. This isn't a problem with documentation being a rush job, it's a problem with some of the records of ownership being hundreds of years old. Seeing as how I would have to hire a special archivist just to access data on an 8" floppy disk, I'm not confident that the blockchain is a long-term (i.e. centuries) solution to any of these problems.