Well, earning a living with Bitcoin is actually possible, but living with a job seems to be the best option. At least Bitcoin can be, at the time, considered as a secondary source, being able to make the life more comfortable.
It is possible to earning a living with bitcoin why? because if your bitcoin is more than what you get on your salary then you say that you can fullytime with bitcoin because it gives you more money than your official job where you don't need to overtime and take some bad hoobbits
Not everyone will prefer to go full time on bitcoins especially those who are earning higher salary from their full time job and the price of bitcoin is an important factor to decide.