If you look at a company of say 100,000 employees, and a generous span of 1 manager to 10 subordinates, there are 33,333 managers - and as they usually are paid better than their subordinates, the cost is typically over 50% of salaries. And it's a rare industry that is not mostly salary as cost.
And we now have an amazing set of technologies and examples of new organisational forms (Linux?) that say "hey, you can eliminate a huge cost base and be more productive.
Wanna bet how the next decade is going to go for those called "managers"?