Cryptocurrency can be unpredictable, but people's behavior is more than. In order for Ethereum to reach the same values, money from external sources is needed, ordinary people will not invest in cryptocurrency because it is unpredictable, who then will be?
Of course, Investing in cryptocurrency is very high risk and maybe you lose big money. But investing cryptocurrency also bring big profit for you if you have good trading skill. My advice is: people should research and deeply think before put money to crypto.