I'll drop in a couple of pennies of opinion also. The 9x23 is a great cartridge, no doubt. I have two and I mostly shoot reloads. The ammo is expensive and very hard to find. If I run across a box or two of factory loads, I'll buy them if the price is not too stiff.
The next obstacle is there is no publicity. A movie or a few magazine articles would help. Most folks have never heard of it. I have had people at the range ask me what I am shooting and when I reply... they usually have a stumped look on their face. I usually tell them it is a .38 Super on steroids and include it is the auto pistol's answer to the revolver's .357 mag.
The .357 Sig took off like a rocket and it is not as good as the 9x23. I have one and it is not that impressive, to me.
So, if you know some of the gun magazine writers, ask them to do a few test and articles on a pistol in 9x23, .38 TJ, or something similar. (They probably won't unless someone spends a chunk of advertising $$$$ with them. Notice the guns that get tested over and over. Yep, the big advertisers.) Anyway, if Baer, Wilson, Springfield, Kimber, or Glock would build a 9x23 it would get plenty of print.
OK, I'll quit crying.
Buddy