SM still worth it
I get it that they're not worth as much as say, AA, but since doing a Delta card churn between business and personal, I have not had much of an issue booking RT flights for 25,000. Sure, they're not going to be available over the 4th of July, but most of the time I've just had to flex up or down a weekend and been fine. In 4 weeks I fly to SFO from JFK for 25k, and booked two tix for my parents to visit me in NYC from SLC for 25k each as well.