Our uses of cryptocurrency and blockchain technology now are similar to how we once used the power of the web to create Geocities pages with nothing more than MIDIs, scrolling text, and under construction gifs, because we didn't know what we were doing yet. But the early computer and internet pioneers were able to see past the proofs of concept and build on those ideas, to create the modern internet we have today.
Bitcoin may cease to exist as a software product, but I think the innovations that it has spurred on will be with us for some time. This technology has the possibility of making business much more efficient by reducing costs that are associated with distrustful parties having to rely on (and pay money to) third party escrow/auditing services. If I want to send a large sum of money to someone else now, I have to rely on third party services such as banks or Western Union to facilitate that transfer.
If you still continue to think "well that can be done with a SQL database now", you're completely missing the point. There's nothing wrong with relying on third parties, but now we have technology that allows us to choose not to if there's a need for it. In that regard, cryptography shares many of the same characteristics. We could communicate securely before public key cryptography was invented, but it broadened the scope and security of such operations, to the point where we espouse using https for all websites, not just ones requiring security. When the time comes, why would you trust a third party if you didn't have to?