If you quit RL job and change to bitcoin, what will happen if you have to go to Hospital for a quick surgery? Who will pay the bill at the end? In my country, medical system requires active job or you have to pay a hell lot for everything, even for consulting with a doctor or pulling a tooth etc.
You can find private doctors or hospitals, they looks like decent hotels, but they are really expensive. So good thing about RL job is that your medical treatment is for free.
And you haven't mentioned pension system that is different in every country, somewhere if you had a good job for 40 years, you can get a pension similar to your salary, but other countries doesn't help you when you get old and you yourself have to gather all the funds that will help you live a decent life afzer the retirement.
To quit daily job is for those who can afford to cover these kind of extra cost from the BTC salary if needed, orhave a decent cold storage with the necessary amounts