Even though this sounds like a good idea, we are still at an experimental stage of cryptocurrency and there are really no systems bulletproof enough to put legal obligations for house titles on. A currency that you don't have all your wealth in is one thing, but if the only place your house title was stored is on the Bitcoin blockchain, that would be kinda scary when a "Bitcoin Classic" vs "Bitcoin Core" rough consensus attack occurs.

Don't wish for too much from the "blockchain", otherwise you're going to get a federated chain government ledger forced on you.