RangerG is exaclty right in that KM is a very open system. I've been training in KM since '86 in Los Angeles and I can tell you it has evolved significantly in the almost 20 years I've been involved. The core self-defense techniques and training methods are very much the same, but many things have removed and more has been added. If something works and is realitivly easy to teach to civilians (something they can use in a short period of time) it makes it way quickly into the curriculum.
When the National Training Center opened in Los Angeles, the Cheif instructor brought in ju-jitsu instructors to teach the ground fighting classes and techniques. The KM techniques weren't eliminated, but the scope was very limited. I feel the system is much better for having done so.
Of course one of the problems with the openness to new ideas is that KM can look very different from one school to the next. But, that make visiting other schools/dojos interesting (and sometimes frustrating).
Outstanding post Mitch!
Let's see what we can do with the next 20 years!
"If you're gonna be stupid, you better be tough."