I agree that it is highly inadvisable to invest everything in cryptocurrencies. The industry is very young and financial experts are still at a loss on how to value these projects. Some diversification will go a long way to bringing peace of mind.
Sometime investing give us better life, sometime we lose, because we can predict the future. But if we are lucky and we know what our doing, it will give us a victory.
I think investing all we have on crypto is sounds like a very risky thing, due to its unstable and unpredictable price, I believe that we need to think of it a hundred times before doing this risky thing because crypto is really unstable it is really frustrating if we loss. So we need to lay aside some property and we don't need to invest all we have.