Bitcoin being a highly speculative element since its value can rise and fall drastically due to news and market temperament. Volatility makes it risky and at the same time, people seeking growth and opportunities pool towards it. I concur that even when banks and governments have been skeptical about Bitcoin, they have been quick to pounce back after any misfortuns. Its decentralized design provides it some form of staying power: its increasing use. There are no guarantees, but its possibility to change money as we know it surely makes people interested and optimistic.
BTC is guaranteed to rise in price and value because the more time passes, the more people and institutions come to it and see it as something worth working with: volatility or not, BTC becomes viewed as something worth the shot, and the demand increases every year.