Let's say a really, really rich guy buys out a really, really, REALLY BIG company... would his first move be to fire all the upper and middle management folks and replace them with inexperienced ideologues and sycophants? And to radically change the product lines to untested new items while cutting the budgets to all of the departments? And to ignore looming market forces that are threatening to swap the whole enterprise?
No.
Or....maybe. Take a look at
what happened to Sears. 
