There's also another facet of the NATO pistol caliber that goes unsaid in all these discussions.
The sidearm may or may not be that big of a deal.
The submachine gun OTOH, is a big deal.
What goes in the NATO sidearm also goes in the subguns.
Let's not forget the other two "wars" we're fighting.
The "war" on terrorism and the "war" on drugs.
It's no coincidence that the use of a subgun has increased in the last 40 years worldwide.
I keep going back to my initial response.
The 9x19 is not an accurate enough round for a low cost to manufacture, reliable and highly accurate weapon.
It's possibly the perfect example of the engineering adage of pick any two.