There are poaaibility that bitcoin will disappear but i believe it will be remain as currency for life. Then more people will using this in the future
Well, there is every probability that bitcoins you have right now will disappear, as an result of a scam or a hack. However, the bitcoin network cannot just disappear into thin air as it is decentralized.
Which is why BTC is so popular.
If you take proper care of your coins at initial stage by saving it in best wallet then I dont' think you need to worry, as there is very less possibility that anyone can steal your coins.