Unless the US President put up something like Wilson's 14 Points, etc, etc, and made the USA co-belligerents instead of allies, the route to armistice would have been quite different.
I think if it had been just about anyone else the war would have gone into a spring campaign and a comprehensive German loss. The other CPs had already thrown in the towel, and were unaware of Germany's negotiations for an armistice. Without Wilson, by November 11 Germany would have been completely on its own, with nothing between the Italian Army and Nuremberg, and the the forces from the Salonika front already on the Danube. The Danube was open, as were the Dardenelles and the Bosporus, to supply and reinforce the combined force coming up the Danube.