I believe it would depend on what your definition of a blockchain is. Because if your definition includes arriving into consensus through POW, then I believe all those "use-cases" would NOT need a blockchain, but a database.
This is where I would have to agree, there are many different consensus mechanism coming to light as time goes by.
Most of you are assuming it would be costly because of PoW or similar mechanism in which require transactions fees in a fully decentralized network, that is a foolish assumption.
No, you misunderstood. I was talking about the costliness of POW/hashing itself, which would require a large amount of computational resources.
It's inefficient for those use-cases.