Yes, many peoples are choosing bitcoins for their source of income.Earning money through bitcoin is morethan earn on a normal job. so many peoples are leaving job and doing earning bitcoins their own ways.
Many people? There's no many people.
As far as we know, Bitcoin is not really known by many, you could say few. But the thing is, yes they've heard about Bitcoin and that's it, they just don't know what Bitcoin really is.
Well they only leave their jobs because that job doesn't pay that much, but if their job pays more then, they will not migrate to Bitcoin.