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It may be from playing too much EUIII and the like, but what exactly would it take for the Holy Roman Empire to fall apart/stop existing? I'm mostly focused on if this were to happen during the 30 Years' War. I know that the nations around (and in it as well) the Empire would rather just have the throne instead of dismantling the Empire, but bear with me.
Let's say it falls apart due to a Dano-Franco-Swede-Commonwealth-ASB Airship fleet, rolleyes what would fill the void of power in Germany?