It's some utopian dream to think the death of the EU would decentralize power. It's currently a necessary evil to put pressure on the already centralized power of the US global hegemony. Without the EU, the world is controlled by the US and China.

The EU is perhaps the most decentralized large power in the world and is held to an astronomically higher standard than any other such power.

https://news.ycombinator.com/item?id=46551972

Do you understand which players want to take away power from the EU and “decentralize” power or better, create division?