As long as it remains volatile, you should never invest solely in bitcoin and consider it as your only source of income. You don’t even know when you are going to gain an income from bitcoin, so investing on it for survival will never be a smart move. Instead, invest on what you can afford to lose, but look for a stable job where you can gain regular income, as bitcoin investment may only give you impressive amount of profits but maybe once in a blue moon.
Even the highly successful bitcoin investors these days have learned to diversify their investments, which only proves that bitcoin alone is not dependable still.