So the 9mm fell out of favor some decades ago and we got a 10mm, then the 10mm Short (a.k.a .40S&W). Now bullet technology has advanced to the point that 9mm can reliably pass the FBI test, and it's back in vogue.
Lower recoil, greater capacity, still expands to 150% or more of original diameter through various mediums, and goes deep enough but not too deep in ballistic gelatin.
So who's ready for an 8mm cartridge that does all that, but with even more capacity, lower recoil, and still passes the FBI penetration and expansion testing?
If such a beast came to be, would you jump on it?