I'm rather with Iceman on the idea of things swinging back in the direction of the small. That always seems to go that way, at least in the US; bigger is better for about five to fifteen years, then boutique stores become all the rage. Then about fifteen years later, people whine about selection and the internet became the big rage. Then they miss the quality and service of the small place and get scared about identity theft and they transition back.
The pendulum is always swinging and the trick is to do what you do well and to not compromise, even as the pendulum shifts away, knowing that the pendulum will eventually come back your way. One of the advantages of the small school with a part time staff is that the part time staff has other means of making ends meet and will show up to train regardless of where the pendulum is, thus they can ride it out.
A lot of people get hung up on organizations, but I think that organizations are simply vehicles that may or may not be beneficial to a school. The KKW is a prime example. Personally, I don't see the KKW going anywhere. Its too well established and far to pervasive to simply go away after one person passes on, however important that one person may be.
But going the direction of the small is, in my own opinion, distinct from organization and requirements of said organizations. While I am aware of organizations and what they offer or don't, I don't concern myself with who a school is affiliated with; it is the quality of the instructor that counts. I looked at a number of places before I made my way to my current dojang. Admittedly, my son and I joined for the kendo classes originally, but now both of my sons and I are practicing TKD here as well.
Within my own area, there are dozens of TKD schools. Still more schools offering other arts. Each schools' staff has a reputation for a certain teaching style. When large companies don't deliver (as they inevitably don't), customers seeking quality will turn to the smaller schools. It is then the reputation and quality of the instruction that will make or break a school. If the school is a top notch school and has KKW/WTF affiliation to boot, thats a nice extra, but not a necessity.
Ultimately, big box martial arts schools will not go away. And thats alright. But as the big boxes come up short in quality and/or shift focus to cater to the MMA crowd (hey, its the next big thing, so the big box must offer it), the smaller traditional schools will see, I believe, a resurgence in popularity. Not a huge resurgence, but a resurgence nonetheless. As people find the benefit in the traditional school, I believe that the traditional school will benefit.
Just a few thoughts.
Daniel