Emperor Joseph lives longer and does not catch an STD

As it says on the tin, what would've happened if the Holy Roman Emperor Joseph I, elder brother of HRE Charles VI, had not died in 1711, and furthermore had not caught an STD and was able to father children on his wife, who herself would not be sterile?

What affects would this have on the War of Spanish Succession, later HRE developments, as well as any potential butterflies within Britain for example?
 
What lands might his brother Charles get ttl if they still don't succeed in putting him on the throne?
 
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