Crypto currency has a very vague future.
They can become the only payment tool in the world or they can disappear.
I am inclined to the first option, but what will actually happen is unknown
You think the future is vague? I disagree 100% because to me it is black and white as your next statement says. It either gets adopted and is a clear winner or does not get adopted and is forgotten over the next 10 years. If Bitcoin survives I would imagine the price would be above 500k at least at its height, but if Bitcoin dies then perhaps it will trade at a sentimental value of $1 or even 1 cent.