Of course as allot of other people here who use bitcoin a source of income and can be, but it's not necessarily a full-time job though and most use it to increase their salary, not completely replacing it. that of course is if it is legal by the government and local law legislation, I agree with those using it as a part-time job, But I don't think people are ready to use it full time.
You have your point.Most of us considered bitcoin as our source of income because of its high profit we gained.And because of that,some people chose to give their full time on it.IMO it's not a bad idea but you really have to focus your time in earning.You have to be very wise in spending your money.Seize the moment when the time is all yours.