But basically if the Miami shootout hadn't gone so badly - departments today would probably be using 9mm, .45 ACP, 38 spl and .357 magnum.
I think we would have already had .40 or similar by now, although there is no doubt that infamous shooting sped the process up. With all the endless debating, which was greatly accelerated on the internet in the '90s, an alternative was bound to pop up (we've had several actually, but only .40 has been a smash hit).
There have been cases where .45 ACP and even the mightly .357 haven't stopped things right away, but the Miami case was given widespread media attention. The squeaky wheel....
Mauser Werke, Schmidt-Rubin, Colt, Walther, HK, Weatherby, Browning, Ruger, Savage, Bushmaster, Marlin, Mossberg, Saiga, S&W, Sig Sauer....a few friends of mine