Maybe its just as well that he died when he did.
It was said by a German officer in the first film; "This war will be the end of him as well. There will be no room in the new world for men like him."
Patton Died with a final victory under his belt and so did not live to be a doddering old man and went out on a high.
Even Patton would have probably agreed that if he were to die on German soil at least he died on soil that he liberated from the Nazis.