I believe the fundamental purpose of judges above all else is to:
-Ensure that the routine followed the rules set forth by the sport.
-To evaluate the routine based on objective and subjective criteria in order to determine which routine was better.
The thing about the legality/safety side is that it's fairly well-defined. You have safety judges and a method by which those judges are certified. I'm sure the process could be better, but there is a process.
For the rest of the scoresheet, there is no such standard. It's set by the EP's. A Jamfest rubric is different than a Varsity rubric which is different than an Xtreme Spirit rubric. It's not just different in terms of the numbers you put down, but to a certain extent the criteria by which you are judging.
To me, without some kind of standardization of the objective standards on how you score cheer, a judges association doesn't meet many of the criteria stated above. You wouldn't be able to decouple judging from the EP's at all, because the EP's would still have heavy influence on the "right" way to judge based on their scoresheets. You wouldn't be able to create standardized training or evaluation, because evaluators and trainers would have to train on multiple scoresheets. I'm not saying you couldn't still have a judging association at that point, but I'm not necessarily sure what the value-add would be.