pilotofjet,
You state EZY are breaking a cardinal rule of "lo cost ops" by moving away from 1 aircraft type. However, if a manufacturer offers a type which is assessed as being far more suitable, and at a much lower cost, then blindly following this 'logic' is not necessarily the right thing to do. Should EZY just stick to 737's forever, based on this 'rule'?
However, it is obviously going to be a real challenge, and they've got to get the crew numbers right, and the training programme slick, in order to deal with that rate of deliveries. Hopefully they'll build enough slack in the system to cope with this training requirement!