A Badenese Succession Question

The second-to-last Margrave of Baden-Baden, Ludwig Georg Simpert, had four children by his first wife, Maria Anna of Schwarzenberg, unfortunately only one - a daughter, Elisabeth Auguste (b. 1729) and thereby useless for the succession - survived infancy.

Now there had been plans to marry Elisabeth Auguste of Baden-Baden to Margrave Karl Wilhelm Eugen of Baden-Durlach (cousin to Erbprinz Friedrich of Baden-Durlach), who even went so far as to convert to Catholicism to marry her and her uncle, August Georg, contracted an agreement which acknowledged that Karl Wilhelm Eugen would inherit the Bohemian properties of Elisabeth Auguste's mother, as well as the style of Margrave of Baden-Baden.

Unfortunately, Elisabeth Auguste refused to consent to the contract, and the marriage fell through. Elisabeth later married the Count von Althann, a Czech nobleman 14-years her junior, in 1775.

Now, what would the effects be if Elisabeth Auguste and Karl Wilhelm Eugen had indeed married? Thoughts?
 
So, due to a recent discovery about the Baden-Baden succession, I've decided to bump this (and because I'm too lazy to create a new thread).

I was always under the impression that Augustus Georg's marriage to Marie Victoire of Arenberg was happy, but childless. However, I've since discovered that there were in fact, at least two children born from the marriage: an unnamed boy born in 1736, who didn't live out the year; and a daughter born in 1737, but dead by 1741. When cross-checking my sources, I found mention in an article on Marie Victoire's patronage of the margraviate's education and religion that:

The marriage produced no adult children are left, so that the Margrave of Baden-Baden line went out and reunited with the line of Baden -Durlach.

concurring with what was said about both children dying in infancy. Why mention specifically no adult children when it would be easier just to say childless.

Either way, my original question still stands. But as a supplementary question, can we butterfly away whatever killed August's son in late 1736 and have a surviving Margraviate of Baden-Baden? And what influence would it have on the future if it did survive?
 
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