Not only that bitcoin is an investment, it serve as our savings and we can use it as there is an emergency needs , so bitcoin had many multiple functions and uses so that is why we can also rely on bitcoin.
I don't think so, bitcoin is very good as an investment but for savings emergency needs is very risk because the price of bitcoin is really unstable, when we need money but the market is down, we will lose our capital if we sell bitcoin when the price decrease, no one can guarantee bitcoin will always in the high value, its better to saving in fiat at bank for emergency money.