It's unlikely that the female dominance of the working class will last very long. As Ann Friedman points out, the aspirations of job-seekers will shift with the market. Men who want a respectable working class income can certainly tackle nursing, child care, and food preparation with as much aplomb as women. What we're likely to see over the next decade is a shift not only in how many women are part of the working class, but what kinds of jobs all working class people do.
Male nannies and nurses, in the minority now, are likely to become more common. The question is really whether female engineers will become more common too - especially since engineering jobs are among the most highly-valued in the market.