I would assume that they're subscribed to the thread (and/or that they would figure it out pretty quick anyway), so deleting posts would be pointless.

Perhaps they realize the negative impact that discontinuing would have, and they're in the process of changing the policy.

I had planned on drastically cutting back my spending on this card (and perhaps getting rid of it), but if they're going to continue counting miles towards million miler status, I may start using it regularly again.