yea...I earn living with btc..but not into any project for now...buy how I earn btc is through faucet sites and trading of btc...that earn me much profits....and use it for daily expences..
Bitcoin can take care of our daily expenses if you are single, but if you have an responsibility of your family then you cannot depend only on bitcoins for living.
Maybe if you are good at trading you can support a family thru bitcoin earning. I am not good at trading but I can still earn a bit. Add that earning to what I earn in signature campaign, it can support myself. But maybe if I become an expert in trading, I can do better at earning bitcoin and can support a family.