Changing the narrative. From the NN 16-13:
Regional Jets
Eliminate all 50-seat RJs and increase domestic mainline block hour protection in conjunction with C-series jet deliveries and the option to add up to 50 two-class RJs (either 70- or 76-seat aircraft)
So what's being proposed ISN'T parking 50 200's for 50 170's. It's parking ALL 200's for 50 170's.
This is a net loss of seats, block hours and jobs at DCI.
This is a GOOD thing.