Bitcoin will stay as worth it because it will never worthless because more adoption will come in bitcoin and more company will accept bitcoin as payment so that we can spend bitcoin more in the future.
Cryptocurrency may likely be the currency for internal use or even as a means of sale on the stock exchange as a commodity. You can earn with bitcoin, and it's true. But whether it will be stable? Nobody knows.
We will never now but what we can do is investigate bitcoin to see if if has a chance. My guess it has a chance to survive.
Which makes me believe in bitcoin.
Of course it will survive in future and bitcoin is not that weaker currency that will disappear easily, and it will be much stronger currency in future and I have total faith in it.