In a similar vein, if criminals want guns (and ammo), they're gonna get 'em.The best quote was "If they want body armor they're gonna get it"
I have heard that the typical use of a handgun in defense is at extremely short range -- 5 - 8 feet -- and that even law enforcement officers miss with more than 80% of their shots. Training is indeed a great idea to raise the potential hit ratio. Training at a traditional range -- specified single lane/target/shooting position -- is great for marksmanship but isn't really that helpful for a high-stress, adrenaline-filled encounter. You definitely need to "get outside the box", so to speak.
If you need to use your gun, you'll first have to remove your gun from your holster. You'll want to be moving to cover. Your targets will be moving. You may have multiple targets to deal with. It may also be in poor lighting conditions. Training for each of these independently and in various combinations is a good idea, but you'll have to seek opportunities because most gun ranges don't allow drawing from a holster, let alone the other stuff. The action games, IDPA, USPSA and such, are great to add stress and combinations of the above in different scenarios, and I would highly recommend trying them out as well as looking for other opportunities.