I hope AS doesn't waste their time trying to match the benefits out of AK since Club49 is already a strong program plus the loyal customers will probably mostly remain unfazed with this promotion as long as AS remains competitive on price ex-AK.
A good way to get back at DL is to offer a similar program to SLC, ATL, LAX, DTW and NYC customers, maybe even more cities in the L48. Many customers are on the fence with the recent changes and this could be a good pushing point for them.