There is no doubt that investing in bitcoin will be much more profitable than keeping your money in the bank. Given the dynamics of the cryptocurrency market, the profit in this case can reach several hundred percent. But this will only be true if the market is bullish. Otherwise, 1-2% in the bank may be higher than you will earn on holding bitcoin.
I agree with your assumptions, but ultimately bitcoin is not for those who dislike price volatility and other risks. Many people don't want to invest in highly volatile assets like bitcoin because they think it's the easiest way to lose money. Therefore, you won't be surprised to learn that there are still many people who want to save or make deposito at the bank at any time.
I don't want to go too far, I think for the people I know also have less confidence in investment assets like bitcoin. They believe more in gold or bank deposito can give them profit and safe. To be honest, I don't want to force them to believe in bitcoin, so I'm not going to make a big deal out of it no matter what the decision is.