Yes, many people focus on the bitcoin world, and that does not mean they just leave their jobs, but they already know how bitcoin works.
I think the focus needs to learn a lot about how to earn revenue, but by not leaving your current job. If you already have a lot of experience, you can try to follow in forums, signature campaigns, trade, or anything else,
If you have a good day job which is paying you decent amount of money then bitcoin can be an good bonus income for you which can be earned in a spare time as I don't think that its smart enough to quit your full time job and get full time into bitcoins.