Should employees go on strike?

There is no way to answer this question accurately without
knowing a great deal about the specific situation involved.  Employees are more likely
to obtain the concessions they want from their employers if they have leverage.  This is
what determines whether employees should strike.

A group of
employees has leverage if the management of the firm needs those workers more than the
workers need to be working.  If the firm is in financial difficulties, for example, it
may need to keep putting out product so as to avoid falling into further financial
troubles.  In such a case, the union will have leverage.  If, on the other hand, the
firm is on a solid basis, the union will have no leverage and should not go on
strike.

This is the sort of calculation a union must make. 
It must decide whether a strike will hurt the workers more than it will hurt the
employers.  This is what determines whether a strike is a good
idea.