The only use case for blockchain is money. Everything else is a scam. We only need one money, the one with the most dominant network effects. Right now, if it every happens, that money looks like it will be Bitcoin. This will take a while. How long it takes depends not so much on Bitcoin itself, but on how bad the competition undermines their use case as money.
In the meantime, people may find it surprising that there is indeed no other use case for the most inefficient database man has ever conceived, other than the on e it was explicitly designed for.