By moving the locus of control, whether it be considered the ceo or shareholders, so far from the actual business and implementing mandates based on whatever the current fancy is and meaningless targets of growth on such a giant scale you get the same sort of excesses.
The current system is marked by irrationality and uninformed and ill considered decision making. With smaller organizations and actual business competition they would be held to account by their competitors or just by running out of money before something catastrophic for the greater economy happened.