bitcoin job are suited for a freelancer ,
unless there is a clear job like maintain a mining farm ,
or creating an altcoin project etc ,
you are worth to quit and do that project .
I was guilty of it. I quit my job for bitcoin endeavor like 3-4 months ago. My return after quitting my day job was not even a quarter of my Monthly income. Good thing that I am now working with my clients again and have learned a very valuable lesson to not leave your post when you are not sure enough to where you are going to be.
Thats the thing which do most people here have doubts on quiting their job just to go full time in bitcoin which seems so risky since bitcoins price is too volatile and we cant really assure that we would earn on daily basis. Thats why its not ideal to exchange you stable day job just to switch on bitcoin full time.