Many Middle Eastern countries are dependent on oil for income. Why is this a problem? What is a possible solution?

This is a problem because if all the oil in their lands run out, what are they going to do? Like if all the oil run out the they won't be getting anymore money or income because all the oil has run out. A possible solution is to maybe find other resources that can also be like a possible income I guess

Explanation:

answer; automatic fire suppression system;