This whole thought experiment seems to me to be a waste of brain power. As some have touched on, who would choose any handgun, let alone a revolver, if your KNEW you were going to a gunfight? As a civilian, the chances of actually being in a gunfight are so astronomically low that it allows us to ponder the question like we're discussing hunting or target shooting: what do you prefer? But actual gunfighting IS NOT like target shooting or hunting, its not a lifestyle choice. No sane person leaving the house in the morning, knowing that they would be in a gunfight at 10:08 would choose a revolver over an auto or an auto over and AR or an AR over an... Its the odds of the occurrence that that allows us the whimsy to use what we like. My take is supported by the broad range of solutions offered: everything from 8-rnd, moon-clip fed modern manufacturing marvels to 100+ y/o good-enough-then-so-good-enough-now antiques. In similar fashion to F1 racing, if a revolver was the thing to use, there would be consensus...on the thing to use.
If someone told me I had to go to a gunfight with a revolver, I'd probably go find something else to do instead (Rule 2 - avoid). On the other hand, if by some horrible circumstance I find myself exchanging fire with a bad guy, it might be with a 2.5" 66, a 4" 686 or more likely a G19. Since the chances are so infinitesimal, I have options.