As of 1400Z this morning, the price of probably the best known (and most hyped) blockchain application -- Bitcoin -- was at $3984 -- down a bit from it's peak around $17900 in December of 2017. I'm told that there are those who think the market is seeking the stuff's true value which is very likely $0.
One thing though. What are all the miscreants who have been devoting their energy to "mining" cryptocurrencies with other folk's resources going to switch their efforts to if the cryptocoin markets collapse? My guess would be something neither legal nor beneficial to society.