It is very difficult to earn living only with bitcoins.
Firstly, bitcoins are accepted everywhere and you can not pay all your expenses.
Secondly, no legal way is possible to earn that much only with bitcoins.
I love to earn a living with bitcoins in future, but not at a moment, as I am not a full timer on bitcoins, but if I get full time on bitcoins then I would surely earn a living with it.
Right now you can only earn bitcoin in trading and small jobs but its still not enough to compared to daily jobs,i will stay with my job and not go full time on bitcoin.