You are right. We should not depend our future on bitcoin as its price is volatile. We are not sure on how it will be priced one to two days or years from now. That is why I am just investing the money which I can lose. Those are my extra I guess. But would be hoping that its price would goes up to secure my future. 
That's true, if you are aiming for a stable life in terms of financial state I suggest that used Bitcoin as your way to gain fund and save it for future to be used for your dream business, cause I know that Bitcoin is a very volatile cryptocurrency and the price moves unpredictable and it is not actual if you are living without stable job.