I have to agree with Damianik. If a high houred FO waits and does his/her command + 500 - 1000hrs PIC thats another year at least. If they leave now to EK or another carrier now they will have that year on the seniority list. I just don't see how 500 Pic on 737 will be of any use if your ambition is to go long haul, maybe I'm wrong.