You just think how big this infrastructure is, how much money is invested. It just wont die, but as always, only a few percent of users will be able to get a profit.
Yes, this is an impressive industry. And its hard to imagine that this could end in the coming years. Many altcoins have been in a downtrend for almost two years now. There are no good working projects (except Bitcoin and Ethereum). And this creates a negative impression.
There is a panic situation on the market, many sell their assets at a loss, others say that the sphere is dying. This is just a great time to buy, since it is such a negative mood that large players are waiting for to play against the crowd.