Ah a new member, from SA no less... Welcome.
My point of contention with your post is simple- what do you do when a threat disarms you, or puts you into a position where you are physically unable to draw your weapon? I'm a big advocate of training in all aspects of EDC, and one of those is self defense without a weapon. There are several disciplines that teach disarming techniques that can be easily attained for anyone with the desire to- I personally improve my current LE training with Krav Maga, but other mixed martial arts gyms teach various techniques that once you get the basics and fundamentals down are easy to continue learning and begin to introduce into muscle memory (as Foxtrot so eloquently put it). Until training becomes an instinctive reaction, keep going. And then when it is instinctive, keep training. Many things, like shooting, driving, and hand-to-hand are perishable skills.