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Why do you guys think Bitcoin will really become the "money of the future" and people will actually use it like one?
From what I see, I think it's possible that people in the future will still trade bitcoin or try to buy as much of it as possible to manipulate the market.
being the currency of the future does not mean bitcoin has to be a stable currency, bitcoin cannot be stable because of its price volatility and also bitcoin forever is decentralized. if indeed you want a stable crypto currency (similar to fiat) then just choose DAI, USDT etc.)
the thing that you must know is that manipulating the price of bitcoin is very difficult, you have to have it in large quantities whereas currently only a few people or groups have a lot of bitcoin, so that in the future even though people continue to trade bitcoin the price will continue to be volatile and difficult to manipulate.
I think Bitcoin is actually unique because of its volatility and that's why making people are trooping in and making use of it as an investment means because they know that the fluctuations of its price can make you as investor acquire profits in your holdings depending on how the market is. And this volatility isn't going to change anytime soon because the use of it by people is what marks it volatility as you have already stated and we all don't plan on stopping to actually acquire more Bitcoin in the future.