The rule of thumb is that they increase the evaluation criteria. For example, if you were "distinctive" before the crisis, you'll now be "Very good". If you were "Average", now you'll be "Below average". If you keep Below average for a certain period of time - you'll be laid off.
You should also expect longer working hours and higher intensity since the consultants will be trying to impress the clients even more.
Some companies (Most often Bain) close their offices as well. People with best evaluations may be transferred, others - laid off.