WI: Surviving Gustav II Adolf of Sweden

What happens if King Gustav II Adolf of Sweden does not die in 1632 at the Battle of Lützen in the 30 Years' War, but lives, say, another 30 years?
 
The 30 years war might have been continued for quite a long time, and further causing divisons in the HRE and effectively telling the enemies of the HRE, "hey time to strike!"
 
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