You're wrong if you think like this. Because for me Bitcoin is very useful for my life. Without Bitcoin, I might find it hard to find a job and a considerable income. I know Bitcoin has many shortcomings, but the shortcomings can be covered by the many advantages Bitcoin given to its users.
You are right your only way of earning must not be enough to run your life, now it is very hard to get everything in life as payment system is getting towards bitcoin gradually, if you will hold bitcoin as side way of earning you will make high amount of profit from bitcoin and your life will be very easy, I think today we need bitcoin the most, as a job as an investment and as saving as well, bitcoin will never consider to be useless until we are having ability to generate high amount of profit from our bitcoin.