Some teachers do want change
I understand the people who say it is wrong to change the Thai education system or to want to change it and that you should just go with it or that it's wrong for a Westerner to try to impose something on a developing Asian country. Thai people do not like confrontation or causing trouble and to make changes to something as big as the educational system would cause them to do a lot of both. I am not a Thai teacher but I would think those two things, along with their low salaries, would cause them to not want or care enough to change the status quo and the politicians working in the education department are probably not the best people for the job. However, there are some Thai supporters to overhauling the education system. They just haven't gotten enough support to create any change yet.
CS