They've already thinned out the bro population over the last 6 months or so, between the routes that will go to the fifty and people going to the 175 I doubt you'll see any change at all.

I'm guessing the recent hires into the 175 might be most effected, especially since some were awarded SFO. They'll almost certainly be headed back to ORD.

FAT and PSP are getting the 700, so brosephs there might have an opportunity to stay on the RJ without changing domiciles.