In short, if you don't like the way American unions conduct business and wish to see them go away, this must be a happy time. If you care deeply about the labor movement, this is the 50th year of bad news.
There are many reasons for the labor unions' decline, but job losses are not among them. Nearly every year since 1970 has been bad for unions, no matter the state of the economy. Businesses have become better at opposing unions, but if Pinkerton's armed men couldn't slow unions a century ago, how can lawyers do so today?
Unions are disappearing in part because of their early successes. The vast improvements in the American workplace in the last century were begat by the labor movement. Having been successful at bringing about what most Americans wanted, many in the labor movement have turned their attention to issues most workers do not desire. One need only mention work rules in most government workplaces to provide costly example.
There is an important question to ask: What will a world without unions look like, more specifically what will replace them? I suspect we are going to see a much more sophisticated set of associations replace unions. After all, the American Medical Association does a better job of squelching workplace competition than any trade union. This model of workers seeking to craft work and compensation rules will mostly benefit the mid-skilled and higher skilled workers. There is little money to be made organizing low-skilled workers, who, after all, are poor and trying to become skilled workers. Whatever happens, it is clear the ghost of the American Labor movement was largely quiet this Labor Day.