No one can be very certain I mean there is no guarantee as to what Bitcoin will become in the future, historically Bitcoin has made a wide spread adoption with a tremendous increase in value, but past event is not a guarantee of the the future event rather it can only be a guide yet we need to consider having certain believe towards possibilities, if Bitcoin becomes regulated and controlled by the government it has changed it purpose of being decentralized which I think it will not be possible considering the anonymity of Satoshi Nakamoto. Volatility is an inherent trait of Bitcoin which is the only thing that is guarantee, yeah Bitcoin can go higher far beyond the value we are seeing today.
It is true that no one can guarantee Bitcoin in the future and I agree with what you say, we can see historically that Bitcoin adoption will continue to increase and even though some people believe that past events cannot necessarily be repeated, everyone will still accumulate Bitcoin. because this asset has the potential to be able to enjoy profits over a long period of time and because Bitcoin is not regulated by any government, of course this will make someone confident that they will continue to collect it because there is no interest of any group that will exist in Bitcoin so that they move volatility.