Having been one of the 200 FOs in the second class I can assure you most have the times as almost all did as new hires. Each has their own reason for staying put. I've been out of the loop for a while, but my sense is that some will start to take the upgrade when they can hold a line as a captain or stay on the jet as a captain (MSP reserve). Not much interest in sitting reserve as a Saab captain and no interest in a line out of base. The two or three of us who were interested in that have already taken the upgrade. Those of us from the initial couple of classes are just now getting back to MSP after about a year commuting; that may help you figure out when you will see some movement. I expect at least six months until I can hold a line in MSP on the Saab and I am towards the lower end, if not the most junior, of those who took the upgrade.