This is what I'm always repeating about blockchains: they're very valuable if and only if you cannot use the protection of contracts and laws when making a transation - for example because you're doing something illegal. In Every. Other. Case. systems based on trust, contracts and law (such as the banking system for example) are more efficient.
It doesn't mean that there isn't room for improving existing systems, just this is probably best done with regular servers and databases rather than a blockchain.