OK, folks, we've had our illusions of meeting Bruce Jet Segal Claud Lee Van Dam in a rumble royal in which the Gerbil Master's prowess with the ancient art of Who Flung Pooy Dung allows him to get close enough to pull the slide off of our Beretta.
Reality check, folks.
If this does happen, if you're dumb enough to allow a potential agressor to come that close to you when you've already got your gun out, chances are he's not going to be a Gerbil Master, or a Reptillian Alien.
He's going to be one LUCKY SOB who manages to grab your gun in such a way that it just happens to trigger the series of events necessary to release the slide lock.
As we've also seen, it's possible to disable many other firearms, even revolvers, with a few well-placed finger strokes or a good, solid, hold.
Smith & Wesson even brought out a break-top revolver specifically for police officers to counter the possibility of a bad guy pulling the latch on top of the gun and popping the rounds out -- the .38 Double Action Perfected Model -- which had a Hand Ejector type cylinder release that had to be pushed to get the top latch to open.
All of this repeatedly begs the question...
What are you doing while this person closes with you and starts grabbing at your gun? Just standing there waiting to get your *** kicked?
Or are you taking defensive measures?
Even after the person has his hands on your gun, are you continuing to fight?
Every "action movie" I've seen where this has happened has the person standing stock still, looking like a huge lump, while the hero/villian waltzes up, gracefully, I might add, disables the gun, and then proceeds to kick the crap out of the person holding the frame and magazine.
As Shawn notes, I can see this as being of MUCH greater concern to the police officer who may routinely grapple with a bad guy as part of his official duties.
But if you're going to stand there like a big old sack of stupid and let a potential hostile get that close to you, especially if you have your gun out already, you got bigger problems that a gun's probably not going to resolve.