Earning bitcoin as a salary depends on several issues. Is your employee ready to pay you in Bitcoins? At the same time, it also depends on whether the employer is ready to pay you in a dollar equivalent at the time of paying the salary. Otherwise, you might end up receiving peanuts when the price if bitcoin has gone down.
it's basically pointless to wait for employers to pay people in bitcoin. mainly because of the fact that not many people (non bitcoiners) are interested in it. too much work, maybe it's not even legal in certain countries, and so on. just use a fixed part of your salary to buy bitcoin with. that's much better.