Based on what we've learned over the past few years, I'm not sure I believe that any more.
Without a central authority, there's no way to be confident that anything is "true". Partly because it's impossible to correct mistakes.
So you get NFTs of stolen art, because there's no authority to verify it.
You get ideas to "put real estate deeds on the blockchain" with no answer to the question "what if someone loses their private key?"
The only information that can reliably be handheld by such a blockchain is information that entirely exists within that blockchain - so account balances, but effectively nothing else.
Even account balances are a bad idea to do on the block chain. Ever had to dispute a credit card charge when you dealt with a sketchy vendor? Well too bad, all sales are final now in this new immutable world.
Instead of going through offshoots trying to find the killer app, I'd much prefer to see cryptocurrency tech evolve in order to bring costs down. Take the base use case of keeping "bank account" records and run with it until it works (as of now, it does not). Out of the viable -- for my definition of viable -- cryptocurrencies out there, the only one I see moving in the right direction is Ethereum. They are taking their sweet time, though.
If a killer use case is needed, think micropayments: The ability to pay 0.1ยข to listen to a song, paying directly to the artist.