The actual sale potential of ASELPOD would be through the JF17 program. This may go up to be a huge number. First, countries will see that it has qualified to be considered by an export customer, and anyone who buys JF17 would want the pod. What may help Pakistan is to integrate a 19-21 tube 2.75" pod which can fire APKWS, LGR, or DAGR, enabling JF17 more suitable for some potential customer countries. The current qualified/ordered weapons payload does not require a ATP as they are all active seeker weapons.
For JF17 numbers, the whole idea of the POD is that only the mission aircraft takes the payload, and it does not have to hang on every aircraft adding drag. Same logic is applied to ASPJs. The payloads are purchased for operational scenarios, and then rotables/hot spares/growth.
Imagine how easy it is to buy a J10, but how hard it is to maintain it. For the F16, the infrastructure is there, spares are there, expertise is there, confidence is there, so F16 wins each time.