A hard one to answer Altack. There are 650ish FOs already in the company, and they are trying for between 90 and 131 DECs this year alone (numbers differ from whom you speak to). We have a little over 80 airplanes now, and I think they are trying for 160ish by 2012.
Average age of the EK driver is quite young so retirements don't happen too often.
So the days of the quick seat change may be over. But you nver know.
Don