Speaking from a KukkiTKD perspective.http://www.kukkiwon.or.kr/english/information/information04.jsp?div=04http://www.kukkiwon.or.kr/english/information/information04_02.jsp?div=04
Based on what the Kukkiwon says about their forms. I see no reason in changing them. They clearly followed the method of which they designed the forms around carefully. Alot of thought and hardwork has gone into them, and if you use the guidelines they set forth they are exactly what they say they are.
After all, they techniques can be used individually, or in combination. And the poomse give us all of that and more. And applications are prevalant regardless of style. The Taegeuk for KukkiTKD have a steady increase in techniques and difficulty, and then the black belt forms even more so.
Even the Kukkiwon stated the forms are Taekwondo. So imo changing what it is now, or getting rid of them altogether would be to get rid of Taekwondo itself.
They even have some basic set applications for the movements on the website. Very basic. Which fits perfect with the writings on technique. And they go on to state, the advanced application begins with cultivating inner strength through controlling respiration(sanchin esque I imagine, qigong) And variations on techniques mastered through hard training. Which is not much different than the study of karate kata.
b. Poomsae containing practicable techniques : This includes practically used techniques only, which are classified into a series of chigi techniques, a series of makki techniques and a balanced combination of chigi and makki techniques.
c. Poomsae containing simple techniques : This is classified into the basic course and the advanced course, in the advanced course, the training of cultivating the inner strength of body by means of controlling the respiration is included. The variations of techniques should be mastered through hard training.
Their philosophy even fits in with the typical 2 year blackbelt. Most of these guys are looked upon by Karate outsiders who generally begin applications much sooner it seems than the Kukkiwon considers for TKD. But after reading what they say, basics, basics, basics up until advanced course(yudanja forms)it makes sense. After 2 years or so most people at a TKD school do have good basics, and most even more applications than set forth by Kukkiwon. After getting blackbelt, the hard work begins, more applications, years in between ranks. Problem is, most people stop the work at black belt and just ride along. But really, who cares about those ones right?
not everyone has to learn martial arts. The poomse are for us. Taekwondo.
EDIT: Im also positive the Kukkiwon holds their 1st dan blackbelts basics to a much higher degree of standards.