I have written extensively on the subject. Cryptos are here to stay but not necessarily in the same form. Many cryptos will disappear, many more will be introduced. Key thing is to analyze which cryptos have the best use cases. I remember playing pokeman a couple of decades ago and they had pokeman dollars that you can exchange for real goods from their affiliates. More of a tangent correlation is like coke points. You accumulate points by buying coke and then can redeem the points.
As of right now, I treat Cryptos as pure speculation.
I agree, I also think that cryptocurrency has a good futur but not all the crypto will stay. It depends of the main objective of the crypto ! :)