Fanatic and devoted fans there maybe, however they don't have limitless fiat money to play with. In the recent past, new found mainstream popularity has fueled inflows into all kinds of crypto products sustaining the strong bull runs despite significant and clear risks.
This popularity has little to do with widespread belief in distributed / unregulated financial systems, and more because these assets have outperformed traditional instruments spectacularly, the allure of making ton of money fast. Eventually it will fade either because there is not enough new people who can/will put more money or an unsustainable growth tapers off.
When ( not if) the second set of players leave inevitably after enough scams, the hardcore fans that will remain and prop up the market and keep it going yes. However without non fanatic users there is not enough money to come roaring back like in the past.
To be clear, it may take a few years or more and few cycles of what you say, markets can stay irrational for a very long time, it is unstable equilibrium nonetheless, and eventually will correct permanently