As of now,I can't consider earning a living with bitcoin as I have my main source of incomeand also I have only minimal amount of bitcoin. But, when my purse grow,i will try trading in big volume and possibly earn a living from it.
Making a living from trading simply not possible. In order to rely solely on BTC, you need to have a bit more stable source of income.
I thinks you are right. Since trading is in a great loss these days. So anyone cannot live only from the earning of trading. Other source of income is also necessary these days.