Best is to have a heart to heart talk with the wife. If she had spent her time to accomplish something in life and if you are asking her to ditch it for the sake of the family don't think that it is fare by her. Some chicks take this in an offensive manner. Besides 2 people earning is a very good thing in this fucked up country.
Don't let her feel that she is just a dependent. Anyway will depend on the woman. So go have a chat with her not with the fucktards on EK.