Careful what you ask for.....
After 40k miles you are earning double miles. Introduce another layer and that benefit will take longer to achieve - perhaps no double miles until 75k.
AS is doing us a favor and is why I stay with them - quicker and more plentiful mileage accrual.
Upgrades are a perk, not a guarantee. Be glad when you get one as there are few to go around on a 737.