And it's the great thing about Marxism that it's the only science that is able to predict the future
Marxism is an ideology, not a science. No [credible] person familiar with Marx's writing has ever claimed it was.
Marxism-Leninsm and Historic Materialism was a regular science at each university in the former Socialist Block.
Be sure that those guys have been very familiar with Marx's writings

The issue is not so much CEOs actual power and control. The issue is the consolidation of wealth in the hands of a few, and the separation of capital (and power) from the people that produce it. I know, I sound like a good little Marxist - the trouble is that Marx and Foucault got so much about the way society ticks right in their writing.
Democracy doesn't function properly when there is a power imbalance. There is a power imbalance because free-market capitalist society does not reward people according to their ability or their production; it might if everyone began with equal footing, but the free-market capitalism applied in industrialized nations over roughly the last century-and-a-half has bred a financial aristocracy of inherited wealth (which I'll point out that people like Adam Smith and Thomas Jefferson even vehemently disagreed with) rather than historical privilege. Net effect is the same, however; one class of the citizenry ends up with far better opportunities and a disproportional amount of both wealth and power than the remainder.
But the free market capitalism has done an other thing in the past 150 years:
The creation of a broad middle class.
If you take a look a the society of 1860: How much persons have had a college education ? The biggest class was the working class, and that means blue collar jobs and hard physical work.
Nowadays most western countries have a broad middle class. Few blue collar jobs, many jobs there you need a good professional education or even a degree from a college or university.
Modern Free Market Capitalism won't work without a broad middle class.
It still needs a lot of manpower in the middle management, a lot of engineers and a lot of skilled workers.
And while not everyone becomes the chief of a department, a CEO, a top engineer in R&D and makes a lot of money its still possible.
All those "smart" traders with big boni ? Middle Class
Steve Jobs, Wonziak ? Middle Class
Yes, there is a crisis of the middle class, but is not triggered by unequal distribution of wealth or missing democratic opportunities.
One reason of the crisis are the huge numbers of children of the middle class.
If almost everyone goes to college not anyone of them has the chance to get a good careerer - or even a good job.
All those books about the Generation X during the 90s ( Fight Club, Microserfs ) are circling around the problem:
Being an engineer or a MBA was nothing special any more and no more a guarantee for happiness and wealth. Go berserk or get over it.
But since the 90s the situation has become worse: A lot of jobs haven been outsourced to countries of the former socialist block.
First the jobs of the working class like manufacturing of simple goods (Cloths, Shoes, Toys).
No reason for the children of the middle class to riot or protest - no one cares about the remains of the working class.
But not their wealth is affected, and now they protest.
The whole concept of the American dream is that someone can start with nothing and become something - but the system has become such that it really isn't possible (except for a tiny fraction of exceptions). Without opportunities to be able to afford good health care, grow up in safe communities, have the support of the people raising you, a life free from violence inflicted on you by others, and the financial means (through a job with meaningful pay) to get an education and be able to work yourself, prospects are pretty dim.
Was the American dream not the dream of immigrants ?
I'm quite sure that all those Mexicans crossing the border of the USA by night still are attracted by the American Dream.
And they still found all those things: a better health care, safe communities, the possibility to send money back to the parents, less violence and even a better future for their children... ... compared to Mexico.
And the number of people for whom that is reality far outweighs the number of people who wield meaningful power, privilege, and wealth...
There's this great perception that buying power influences corporations, but the reality is that these corporations make literally billions of dollars a year, are beholden to only a small number of the shareholders that wield any power in the company, and even an organized boycott is never going to have 100% participation. Notwithstanding that fact, the consumer power of the hardest-hit fractions of society is much less than the relatively-indifferent-but-shrinking middle-class. So, the power of a single individual to confront a corporation is essentially nil.
Well, the power of a single individual is also nil in a democracy. One vote does nothing, if millions of others also have the right to vote.