Distributed identity / self-sovereign identity is a good use-case that blockchains are perfect for imho. But that solution is quite complex hindering its adoption.
"But that solution is quite complex hindering its adoption."
Generally inventions solve problems by making them simpler, for this to be a valuable invention it would need to be simpler and less hackable to use than log-in with google/FB/github. I can still recover my google account if I forget my password, and don't have a reset setup. What aspect of distributed identity/ self-sovereing identity do customers care about? how does blockchain simplify this for them?
Unfortunately one of the requirements of a good identity system is that it should keep personal data secret from parties who do not need it. This means that blockchains on their own aren't a good fit, since by design they share all information with all parties.
Having said that, BrightID uses a blockchain and seems like an idea worth exploring.
