30SC is an answer to a question nobody asked, the average gun buyer doesn't get a boner off a gun that carries a couple extra rounds.If it can get off the ground, I think .30SC could become really popular within 10 years. Perfect fit for p365 size format. Someone will make a 15+1 flush fit for a 365XL sized carry gun. Then we will all argue about .30 vs 9 the same way people used to argue about 9 vs 40.
On the other hand, the civilian market tends to follow whatever the FBI and police are doing, and I suspect they won't be getting rid of their 9's. LE contracts mean mass produced ammo. /shrug