What is wrong with that? There are lots of new technologies that don't solve some specific problem. They were just created in the name of science or curiosity or even just for fun. Real world , "useful" applications may not come for decades.
If the best argument in favor of them is "well, they're not really good for much right now, but someday somebody might figure out a good use for them," then it's hard to see why people are so excited.
(Though, maybe it's not so hard to see why people are excited if the folks who are excited are all crypto fans who want to build hype to drive the prices up....)