It's hard telling why he thinks that, other than being a tired CFI?
If growth continues, however, FedEx will either set up a nice career pathway all the way from CPL to mainline (and this is exactly what they are discussing, although it is very much in the planning phase) or they will find themselves having to go a whole lot lower in the barrel than "feeder trash" to keep their airplanes manned. Lot at how Emirates is hurting right now, even the big players aren't immune. FedEx has been having people leave classes for better jobs already and it doesn't look like it's getting better. For now they have plenty to draw from for mainline, but they are in a bad spot for staffing feeders. Personally, when I get to that point in my career I will most likely turn down the FedEx job and take a job at an airline that has me flying primarily domestic, daytime flights, for slightly less pay. That's just my personal preference.