Is there any realistic means the Nazis had of throwing the Allies altogether into the sea at Anzio? Was the weight of firepower on land, sea, and air irresistible to a point where there might be worse reverses but not a total German victory? If, and the first question is the decisive one here, the Germans actually throw the Anzio landing out, what are the impacts here for the Allies strategically speaking?
Personally I think the weight of firepower and the Allies' total strength was unstoppable, unless the Allies had really overextended themselves. I also am not entirely sure how much Anzio directly contributed to the fall of Rome. Or how much reverses in Italy impact the western war.