Wage rates have decelerated across a broad range of industries and occupations, and unit labor costs have fallen sharply. A simple histogram of the distribution of nominal wage changes in recent years does show a spike at zero, indicating some resistance to reductions in nominal wage rates, but the spike does not seem particularly large relative to those in earlier recessions.
In any case, because the difficulties suggested by this argument arise from the interaction between nominal wage rigidity and a deficiency of aggregate demand, the most straightforward way to overcome problems caused by nominal wage rigidity would be to expand aggregate demand.