This is one of the major problems with a program that guarantees work. The only thing that can really be done about this is to set the program up in such a way that it explicitly lays out the conditions in which people will be retained in their jobs. The government has to set up clear rules at the outset that specify that workers can be fired for performing unsatisfactory work. If the government does not do this, it will be stuck paying for substandard work. So, the government cannot do much about this after the fact. It has to be proactive and set up the program so that this contingency is planned for.