While your argument is a fine one, I make a large distinction between factors that affect a cartridge and manufacturers that do the same.
In the world of the 10mm, you can credit the designers of the round and Jeff Cooper (and his column) for a lot of early success of it, but when it's time to point the finger at the key people who hold the power of manufacturing to actually alter the course, that goes to folks like Dornaus & Dixon, Smith & Wesson, Glock and Colt. And S&W played two parts... if not for their fine 10xx series that was adopted by the FBI and subsequent other, smaller LE organizations, the cartridge would have been less successful. Their ceasing production of them to focus on the .40 cal was the opposite.
While the FBI had a large hand in the early success (and quick demise) in popularity of the round, they were an end-user, not a manufacturer.
An example of my thought process-- the .327 Federal Magnum. If it succeeds in the long run, I would give a heavy nod to Ruger for chambering it in the SP-101 and then subsequently, in the GP-100 and Blackhawk, and hopefully, the LCR. If it fails, I will have no qualms about blaming ATK/Federal directly, for their help in snuffing out any kind of momentum by dropping the ball completely when it came to producing plenty of factory ammo and handloading components where they quite catastrophically have failed.
That's not to say that the buying public hasn't had a hand in the success/failure in it, but a mere fraction that pull the actual manufacturer's do.