Currency failure generally occurs due to the type of hyperinflation, and there is always the potential for technical failure, currency competition, political issues and so on. As the main basic rule, there is no currency that can be considered very safe from failure and difficult times. so is it possible that bitcoin can become worthless?
I think with the fluctuations that occur and decentralization in crypto, users will understand the value of crypto, worthless can happen and you already understand that because there is no currency that escapes damage including FIAT which depends on the country's economy.