I will quit my day job when my Bitcoin earnings are more than my day job and give my best to increase the earnings. I work 4 hours a day on Bitcoin and I work for a Media company. As of now my day job pay check is 5 times than my bitcoin earnings. But it is not wise to compare this( day job 8 hours - bitcoin 4 hrs). I am setting up few business based on Bitcoin, when those give successful result I will quit my day job.
I will never quit my job in order to go on Bitcoin full time because that is just not smart to do because |Bitcoin is not steady.
That means that you are not going to be sure if you are going to make money every time.