No there is no upgrading on any Fleet..... You stay where you are. If you apply as F/O then you stay as F/O.
I just run into a pal who told me that during the past 3 months the no-returns and the resignations have increased. F/O´s who joined in 2008/09 left again. Captains who joined during the past 3 years are on the run as well.
Ask yourself why.... and then rethink about your action. See another Thread here as well about the no show rate. That should draw a picture.
Fly safe and land happy
NG