Except that after a number of years have passed and hundreds of pilots "flowed up" to mainline. Now you have several hundred "flow backs" to displace most of your captains.
Everything comes with a price. Those Captains that could get displaced will also benefit from the flowthrough, and probably upgrade quicker in the first place due to pilots flowing up. Why do regional pilots believe they should get everything for nothing? Why should the NWA pilots use their negotiating capital to achieve a flow-up for the XJ pilots and not receive any furlough protection in return? Be reasonable.