it can never be possible for cryptocurrency investment to be a must for the future, and let me quickly remind you that cryptocurrency is an alternative currency to the fiat, cryptocurrency never came into existence to eliminate fiat, so be guided don't allow anybody to deceive you by saying that cryptocurrency investment will be a must in the future, so only invest what you can afford to lose in cryptocurrency, don't within your capacity.
Yes cryptocurrency can be use for buying and selling of goods and services, but human survival can never depend on cryptocurrency not even in the future, and secondly fiat is not losing it value, because majority of people that are using fiat more than those who are using cryptocurrency.
Fiat currencies may lose value if they are in a country suffering from inflation and a turmoil economy. This may lead people to seek cryptocurrencies as a more stable haven and value-preserving alternative. Investing in cryptocurrencies is an optional choice for individuals who believe in the potential of these currencies to generate returns and remain resilient during crises , pandemics, and wars, serving as a fast and efficient means of payment and receiving funds with just a click.
Both fiat currencies and cryptocurrencies have their advantages and disadvantages , so neither can completely replace the other. Both have valuable benefits for future survival.