I know this is going to be a very unpopular opinion, and I see both sides, but I think any "International" division should be a worlds division. I understand completely why people want to keep worlds just 5/6, but if worlds really is the world championships it needs to represent all international divisions. Plus, realistically, I think international teams would actually far WAY better in an O4 division, and I think it would really contribute to the growth of the sport. I know many European cheerleaders tend to start when they're older and they also tend to have troubles getting level appropriate tumbling (I mean, a full isn't really even level appropriate for level 5 any more), so realistically a 14+ division that's level 4 is something more international teams would be likely to be able to be competitive in.
Maybe we could finally start getting trials/semi-finals for more countries.