Not to mention, what's saying that Pittsburgh doesn't score on 4th-and-an-inch on the next play, anyway, even if the original call had been that he was marked short (and not overturned by replay)?
That's true. Or Bettis could have fumbled, there is always that 1 in a 1000 chance that could happen again. Reguardless if you are going to count on getting questionable calls, you don't deserve to win. Seattle did not do enough to deserve to win and probably would not have won even if they got some of the calls.