That's what Elon did at Twitter and it hasn't been working out very well.Kraft didn’t go far enough. He should have sent an email to every assistant AD stating that he needed every AAD not busy at the moment to immediately report to his office for an important meeting. When they were all present he could have fired them en mass.
This accomplishes two things;
1. It clears out dead wood.
2. Reduces congestion at the coffee machine and water dispenser.