If it gives a good assurance for a good source of income then why not, but as of you know bitcoin after a stable job then as should say that maybe bitcoin is a part of mysideline job .But if in long run if it gives you more than your stable job, then maybe I will stay focus on bitcoin and quit for my day job.
Reasonable answer for this thread, it can be assumed that at the point where you make more from BTC than a real job that there's definately some skill of reading the market(or enough knowledge to make an educated guess of market trends) so if someone gets to that point switching jobs sounds completely reasonable.
Because it is not always our job will give us a better income, it is apparent that our job can give us a stable income but the question is, are we satisfied with that? If not, we have to venture into other business and we need to risk a little bit to reach our dreams in the future.
Yes you are right, having a job is just getting some assurance that you are going to have something for your daily needs and you are going to work for it. That is why you need more source of income such as bitcoin if you want to have good earnings and get rich. You don't have to sacrifice anything what you need is proper time management.