I see at least too reasons why this isn't such a great idea. 1. As the real world assets don't reside on the chain, you need to trust someone who says the assets are there and there are only as much of them as claimed. 2. There's no incentive to run a decentralized blockchain for this just like for all use cases besides money. Just do it more efficiently and use a database, only bring the UX to 21st century.