this is my opinion right now, I think blockchain technology is here to stay but I put into a debate if crypto tokens will be here to stay.
We can't achieve a decentralized currency without a valuable token in it(Bitcoin). Indeed blockchain technology could survive without cryptocurrencies but it will end up to be centralized technology which it is useless to not maximalize the potential use cases of the blockchain.
~snip
having said this it is also really posible that cryptos stop existing at all, because there are coins that really don't need a blockchain and are just pump ICO'S that have no real purpose, the only thing that its left is the blockchain technology by itself that dosnt really need to have a token with value attached to work, the world could adopt the blockchain technology without the need to have a pump token attached to it
The problem occurs is because there are still a lot of people that deceived by a useless project. Scammer won't keep recreating an altcoin and coming up with the same idea(no purpose and no real life usage) if the scam method isn't profitable.