While I agree with "GB", and generally I am not a big conspiracy theorist, consider the following. When did the PUSH for LE to change over-back to new 9mm guns and ammo occur? Look at the timing. After the 2016 Presidential election the slump in firearms sales began and the market became saturated with firearms at bargain prices. How could the firearms manufactures and ammo manufacturers create a new market? Convince the heads of LE that their current firearms and ammo were "not effective enough and too expensive". Convince the powers that be, they need to "upgrade" to new more effective ammo and by the way you can't use the new "more effective & cheaper" ammo in your current firearms. Wallah new sales in-coming. Never under estimate a well thought out sales program.
You nailed it . Then "Joe Shooter" had to switch because LE did. All now want a 9mm that holds a box of ammo. The 40 & 45 are better. Plus anything you can do to improve the nine you can do to the 40/45 to make even better...Lots of followers out there.........Not many leaders.