People will stop with Bitcoin if they think that they cant earn some profit with it, or if they lost a lot of money with it and that is really bad, the people that is stopping so early dont have patience and that is not good.
To make some profit with Bitcoin is patience a really important role in Bitcoin, without patience you cant make profit with it.
There are some people who are suing bitcoin as a normal currency and are getting benefited with the more opportunities of online earning with bitcoin, so they will not leave because of that reason.
people that they have enough money of the world they don't need bitcoin and that is why the y stop using it. Bitcoin also take time so for some people is not a good thing to do bitcoin. Is nice to take some break of it and hold it.