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.