If worker's wages had increased, the GDP would have increased, if other things such as the employment rate were unchanged. The growth rate of the median and average family income decreased about 1970. In fact, on the average, the growth rate was sustained. At what family cost is another matter. In the light of the family income trends, consider the trends of college costs.
Private colleges are higher of course, and show the same rate of increase.
The federal government is helping. Here is a little data to compare with the costs shown in the previous graph. Once socialism is eliminated from the U.S. the students will be able to earn their way honestly.