I'm pretty sure second officers will become first officers on 319 or 320 or 757. Maybe, first officers DC-9 or MD-80 for a while. I'm sure NWA do not layoff all of it's second officers. Same idea Delta's second officer L1011 and 727's move to 737-800, 757, 767, 777 and MD88.
There are so many captains will be retire in a few years and so first officer will jump to become captain.