Saving is never a wise thing to do. You should invest your money instead of saving. Saving is for people do not have the power to risk their money for a bigger profit. There are many places you can put your money in. The cryptocurrency is just an example. You can invest your money in real estate, opening your own business, etc
The smartest thing to do in saving is to invest in a good way and to think of the best thing to grow in your investment so you can grow it right
I do not think that this is going to happen, crypto currencies are in its early stage, importance of crypto currencies are increasing from time to time, and therefore we are not expecting that crypto currencies are going to die so soon. I think that investment in bitcoin and some other crypto currencies is safe and profitable.