The problem is folks "think" they should be in spot B, while in spot A. Those who left look back and mentally only want their past to crumble. It's a psychological mind game. Those who say "I wish 9E the best" after leaving portray Pseudo-certainty effect to the definition. Looking back, any change in thought is deemed a rational thought if the outcome can be better than present day, with reinforcement if the thought proves true on even on a limited level. Furthermore, many here are entertaining the ambiguity effect and gambler's fallacy to say that the past WILL BE the future by repeating it with support of others, coupled by a limited basis of past truth, regardless of past circumstances.
But, that's none of my business. It seems those who were the most negative have left, known as negativity bias, and the joy of that conundrum is the fact that those with a bias tend to employ Semmelweis reflex to make sure their thoughts and feelings are provided as the truth.
The mind is a fun playpen, especially with anonymity of a message board.
Endeavor will be fine if DL shows they want the airline to work. It has been repeatedly said by everyone, sans ALPA, that 81 -900's is the plan. The difference was that the shedding of -200's was planned to be via SSP and Major/LCC movement from CA's, not the fleeing of FO's to regionals. We shall see if the latest changes yield positive results.