Quitting day job at present is not the right thing. There simply aren't enough job opportunities in Bitcoin to make very much money. The number of job opportunities come primarily from those who freelance or start their own business, aside from that there aren't any long-term paying jobs.
 It's too risky to depend only on bitcoin, its always good to have a good and secure full time job which takes care of our family too, and also provides additional benefits which bitcoin doesn't.
I mean that of course It is advisable If you can afford to take risk by living only on bitcoin then you can go for it, but you also need to keep in mind future uncertainties as if bitcoin disappears then you should have alternate option for living. First think about the physical work. Dont rely on this online jobs because you dont know to when it will last. Plus it is bitcoin we are talking about there could be ups and downs.
Qit from real job and focus to bitcoin is not a simple plan. We must ready for any chase, maybe our way to earn bitcoin will be closed. Or the mining not profitable again, and the hardest or difficulty to earning bitcoin is increase to much.