AFSS wasn't developed with the idea of making the launch tempo increase, rather it was developed with the intention of "allowing" the launch tempo to be able to increase.
A lot of people tend to forget that during the Cold War, there were FAR more than 48 launches per year. I know someone who worked on each of the programs up to the shuttle program (after which he retired), and during the early days, including testing, he said there was often upwards of almost 200 launches! Of course, things were different, and many were test flights.
Today, there has to be a need. When there's a customer, they'll pick a rocket.
The range requires some time to basically "reset" for the next launch. However, if you have an automated flight system, that reduces the number of range assets that must be "rebooted" prior to the next launch, meaning that you could possibly have several launches in the same week, or even two launches being conducted simultaneously!
So I wouldn't say that it's made good on it's promise yet, but I would say that it's allowed for the possibility to occur, when and if that demand is required.