You're saying that the value of a job isn't as important of the purchasing power created from its wages. And as I said, I generally agree that we have more purchasing power. You don't need to justify that point any further or defend it with an Economics 101 lesson. (While I'm not an economist, I am a mathematician, who, as such, is inclined to tell you that "you and ten people" is eleven people total, though your math indicates a labor pool of ten. Try not to fail mathematics when you argue mathematics.) Arguing about purchasing power being up when median income isn't is like a patient telling his doctor that he's not worried about his cholesterol levels because he exercises everyday and feels fit. In both cases, there are indications that things aren't as healthy as they seem.
I disagree that purchasing power alone, apart from job value, is the only metric worth evaluating. And you already gave the reason why: The existence of capital induces demand for products, which induces a demand for labor. Median income measures the strength salaries have to pay for products and services, which induces job creation. It matters significantly. So when lower-wage jobs replace higher-pay jobs*, when existing jobs producing the same product pay less to laborers, and when jobs move to overseas markets where labor is cheaper, less demand for labor is induced. Less demand for labor creates less demand for work, restricting access to capital among laborers, which restricts their access to goods and services, decreasing quality of life. All this happens, even if our purchasing power has risen relative to median income.
Also, I found your labor force statistics fascinating. Honestly. Though I'd like to know their source.
Finally, I don't disagree people want security, but they want it through a job. People find value in work. If you don't believe me, visit with some blue-collar workers, and listen to Mike Rowe's take on it.
* For example, manufacturing jobs are down, while Leisure and Hospitality jobs are up. It doesn't take an economist to tell you that they don't pay the same. And this is happening in labor pools across the country.