Some good well thought out posts here about whether to stay or go.
In regards to the Air force structure Cloud Basher is right to say the airforce doesn't want everyone to stay after their ROSO expires. However having been in a Squadron with an average of 1 1/2 years on type and a Squadron with an average of 5 years on type I know which one I'd rather go to war with. I think the airforce leans too heavily on the high through put model.
As for myself I firmly believe that after 10 years of ROSO you have the right to look after number one when it comes to deciding whether to stay or go. If the airforce wants higher experience levels over youth it needs to do something about retention. If not then people will vote with their feet.