The thing is, what use case can benefit from a blockchain?
Scamming, gambling, crime and speculation benefited from the lack of regulation, but barely cared about the underlying concept of a bitcoin.
But for anything real, much better solutions have existed for decades or centuries.
Blockchain is a solution without a problem and has been that for 25 years now.
If you have a solution that hasn’t found a problem in 25 years, chances are that there will never be an actual problem that solution would solve.
So the killer apps of blockchain remain scamming, gambling, speculation and crime. Until there are more stringent regulations, then they’ll go back to Western Union and Paysafe cards.