Crypto is here to stay.
In the future maybe become as alternative for cash. Many think it will become the alternative for digital payment, yes... but maybe only for cash transactions that are no longer possible in the future? In Germany, there are a few banks that no longer offer cash in the stations. If more banks follow, where will you get the Cash over the next few years? From private sales and how do you turn cash into digital? Bitcoin is an alternative.
Aside from that, there are lots of greedy developers that wanted to milk investors by making cryptocurrency out of thin air. This practice will continue as long as there are investors that is not researching and is willing to gamble their funds to greedy developer. So this is one of the reasons why crypto is here to stay.
But not all developers are greedy, there are honest and just developers. They create projects with innovation that bring new technology and idea to the table. So without financial gain purpose, there are developers that loves to publish their thoughts and creation and got rewarded because of their brilliant innovations. I think this kind of developer will continue to create their crypto project to bring more ideas and inventions.