Why bother with divisions? Current regulations allow organizers to limit events. Divisions are just an ugly grouping that doesn't make sense (why is Pyraminx similar to Megaminx?) For somone who competes in just 3x3, Pyraminx, and Magic, that's spanning 3 divisions. And there's a huge difference between someone doing 3x3, Pyraminx, and Magic and someone doing 2x2, 3x3, Pyraminx, Megaminx, Square-1, Clock, OH, Feet, Magic and Master Magic.
Regulations already allow organizers to restrict events, and I've done that before (choose between 5x5 and Megaminx, but not both). People are always concerned about Worlds and making sure that all events can be held there. I think the fix for that is for people to realize that they aren't entitled to do everything. People at MOA complained about some of the cutoff times I had, but people need to start realizing that if you want to do a full average of 5, put some work into it. Also, the majority of competitions aren't Worlds or other major events, they're one-day regional events. They won't have all the events today, and they won't have all of them if new events are added.