I think we should keep the international worlds divisions the same for right now. If we added an international 4.2 division, there would need to be a lot of restrictions. Like what Kingston said about limiting the number of teams that come from that country, for example. I don't like that many restrictions. Also, I think if there was a 4.2 team, only one team from each country should make it to finals.
However, I would like to see a "junior worlds." I'm thinking something more along the lines of a junior olympics. Yes, I know that the cheerleading worlds is NOTHING like the actual olympics and the "junior worlds" wouldn't be like the junior olympics. But it would be our closest version to it. The "junior worlds" would be where I think international teams could catch up. Kind of like an all-levels championship, but one location with international participation for youth and junior levels 1-5 teams. No minis, no tinys. This would better prepare international teams and have all ages use progressions. Maybe the first year just have junior divisions and see how international participation is. Then add youth, if possible.
I feel like lowering the level for worlds would not only make it less prestigious, but also the US would still dominate. Sure, some international teams will still do better as a level 4 or 4.2 team, but look at all the teams that are catching up quickly for level 5 and 6! I think there are going to be just bad countries in general like any other sport. Then there will be really good countries (like the US, Canada, China, etc) that will generally dominate for a while until one country has a burst of talent and dedication.