Well, I believe it's time to stop separating the classes by power displacement. There will be 19 turn guys who would be slower with a mod motor as an example, so why not start separating it by skill level like nitro currently does? And with the current motor and battery technologies the power gap is closing anyway.
If it were up to me, the electric class setup would be:
Novice Open
Intermediate 2wd Buggy
Intermediate 4wd Buggy
Intermediate Truck
Expert 2wd Buggy
Expert 4wd Buggy
Expert Truck