GM Parker was constantly updating and evolving his art, so I don't think he would have a problem with his students doing like him after his passing
Maybe. When Ed Parker changed the system, he didn't change the principles and concepts. You have people out there today that don't understand the core system, making changes. Yes, Ed Parker said he wanted his system to update with the times. I believe that he also said "Kenpo never changes, it continually refines itself", I am pretty sure that he wouldn't have completely gutted the system like some are proposing.
Many of Ed Parker's changes to the system were basically in the form of adding more material to the belt ranks. Lets not forget that he was a business man with a large family to support. In the early days of American Kenpo, you learned the techniques, 32 extensions, A few sets, and forms up to 6 by black belt.
Today, you have what, 72 extensions and scores of multiple sets, that in the opinion of some of the older guys, add nothing to the system. Many consider it filler material. When you add in that Ed Parker made a career out of Kenpo, and that he had a large family to support, extra material would mean students would stay around longer. Long term students meant that the schools stayed open and made it possible to pay the bills.
It's funny, the old guys who learned bare bones Kenpo were tough and could defend themselves. Today, too many people can spout off theory until the cows come home, but can't break out of the ideal phase. Kind of makes you wonder.
I know this won't be popular with some people, but so be it. If people want to change Kenpo, then change the way that it is being taught and practiced. Make it have some meaning. Just going through the motions to accumulate rank, isn't doing Ed Parker any justice.