They are not going to freeze-dry these guys. They are hiring now because of retirements but also because of an increase in seat miles being flown and aircraft on order. Predictions are always written in smoke, but Boeing is predicting a need for 117,000 additional airline pilots in North America alone between now and 2035, a number that would overwhelm the number of pilots currently working in ALL regionals as well as current military training numbers:

Boeing Global Services Forecasts 1.2 Million Pilots and Technicians Needed by 2036 - Jul 24, 2017

Will any of this really happen or will it be derailed by a recession/depression/war/famine/terrorist attack/catastrophic meteor strike extinction event? Who knows.

But the trend is your friend to a degree not seen since the immediate post WWII era. that's about all anyone can say. There really are NEVER any guarantees....