It is not a surprise that WN is devaluing its mileage program. As I have repeatedly said, that is the trend the industry is moving towards and, as heat as Delta takes, it is going where other carriers will follow.
The bigger takeaway w/ respect to WN's decision is that Boeing has informed WN that they will get the 737-MAX 7 certified in the spring of 2024, another 6 months after the latest revision which means the MAX 7 will enter service for WN in late 2024.
WN has some old, tired 737-700s that they are trying to keep in service and it is getting harder and harder to keep them reliably flying.
Southwest's loyalty to Boeing is being sorely tested.
And United's commitment to the MAX 10 will be tested equally as severely as the MAX 10 will not enter service until 2025 at the earliest. While WN and UA can switch to the MAX 9 or 8, there is a lag in the time to convert models and there is a buildup of MAX 7s and MAX 10s that are waiting to be delivered. Both WN and UA's strategies are being continually hit by Boeing's delays.