Bitcoin is only a decade and five years old, the interest it has yeild and it's growth over the years both in price and community support has shown its uniqueness and should be taken as a serious investment. Don't trust a currency that depreciates over the years with your investment rather take advantage of bitcoin volatility today.
Dollar is even better. Research more about fiat of each country in the world and see how inflationary governments of the countries are manipulating it in the same of helping the economy. Fiat is the biggest scam on earth. People from many countries hold USD because if their highly devaluing local currency. But USD is not different but better than them. If the price of bitcoin fall, best to buy and hold it and you will not regret that.