Just let them leave and find their own jobs before they somehow be more unstable in their emotions when it comes to trading what's left with their Bitcoin. Those ways you had mentioned to earn Bitcoin aren't that much worth the time except for trading unless you might need a change of game in playing with your coin around the market.
Sometimes it is funny that people think that getting "rich" is too easy in here. In fact the unstable price would lead their thoughts into this since it is undefined and by the means of growing price leads them finally into the final thoughts of the possibilities of getting rich in here.