It is possible, but only if you have the necessary skills. But I don't recommend you completely abandon official work. No one knows what will happen with bitcoin in the future. You risk to remain without money and pensions. You will agree with me it is very risky.
Exactly,, it is possible to earn enough bitcoin without job. Sometimes it is higher value that you get in bitcoin rather than the regular job. And also from regular job you work 6-8 hours but from bitcoin you can earn enough or more than you expect.