The people with the power to effect change--political leaders, business leaders, people influential in the media and entertainment--numbered tens of thousands.
The rest of the boomers were just along for the ride.
In academia, the very oldest boomers along with those born in the late 1930s or during WWII had a big advantage--they were in a position to get academic jobs when universities were expanding during the 1960s. By 1970 or so the job market dried up and from then on getting an academic position was much harder than in the 1960s.
Plus boomers born to a rich or upper middle class family had a much different experience than first-generation college students or those who never went to college.
One of the worst disservices you can do to a person is to tell them it’s someone else’s fault they can’t get ahead.
I do not agree with your assessment of the easier time because of expansion being unique to that time period. There have been expansions in varying sectors many times in history. The trick is to use your natural gifts, luck, hard work and oportunity to find & mine the possibilities of your time.
The boomer whiners would be more believable if there weren’t so many fortunes being made in recent years, just as in the past. History is replete with those successes. One of the marvelous things about America is that classes aren’t fixed. People move up & down, often several times in one life.