I know a lot US FO's and NONE of them are planning on going back to a taxable $26,000 (CAL) 1st year pay with no healthcare and upgrade a decade away - none. Fedex is out due residency rule. Not to mention commuting to NY for a couple of years (cant raise a family there - too expensive)
Are they frustrated? Yes, in particular the Airbus guys as they dont get their monthly fix a la T7 crew - but stupid? No.