Bitcoin is one of the best investment right now in the world and some people are already going into it however there is still larger number of people who has not started Bitcoin investment and that is why Bitcoin still has a long way to go, the more popular and the more people invest in Bitcoin the more valuable it will become.
Bitcoin has proven to be the best investment over the years, and nobody with a good knowledge of Bitcoin and cryptocurrency in general can deny the fact that Bitcoin is not the best investment. Considering what early investors have made from Bitcoin since its exitance, I don't think it can be compared to any other investments, such as real estate, gold and others like that.
Some people stop Bitcoin investment after some time indulging in it and is because people who told them about Bitcoin didn't give them the right narrative some people will tell them that Bitcoin will give them huge profit in less than no time making them believe Bitcoin is were you can make quick money which is not so, in Bitcoin investment you need to be patient because it takes a long time for Bitcoin to grow.
Yes, I agree with you that some people have quit their Bitcoin investments because it is not meeting their expectations. They thought it would make them rich quickly, but that is not happening. Any investment that promises to make someone rich quickly in the short term usually involves high risk, which I would consider similar to gambling. When someone engages in such investments, they are likely to lose easily. If more people can stop thinking that Bitcoin will make them rich quickly and instead view it as a long term investment, it would be a great idea and could lead to significant benefits.