If Piggy's ideas could have found a consensus with Ralph's help, maybe things could have been more organized and civilized on the island. Though I agree with the posts above suggesting that Piggy's social stature was rather meagre, there is an argument to be made that all the boys were prepared to go along with the group whatever the group may have decided. If Piggy's ideas could have carried the day, regardless of his social position, maybe violence could have been averted.
Piggy might have still been alive, but he might not have. Basically, the boys undergo a severe breakdown in civilization. It was bound to happen sooner or later. If Piggy had not died then, he likely would have died some other way.
Although I agree with the above posts, it is possible that the other boys might have shown Piggy a bit more respect had Ralph treated him as an equal instead of as the nearly blind, fat, asthmatic kid. Piggy might have survived the ordeal on the island, but he never would have completely been accepted by Jack and his hunters.
I unfortunately have to concur with #2. Let us remember that Piggy was the real odd one out among the boys, and was laughed at and made fun of even by Ralph himself. Although he could be argued to be the voice of reason, and to possess the necessary intelligence that the boys needed, there was no way that the rest of the boys would ever listen to him, and if Ralph had, the situation might have deteriorated even more quickly.
I don't think anything would have been different. In fact, I wonder if Jack's bunch might not have liked Ralph even less. After all, Piggy is a real joke to those guys. He's a fat kid with glasses and no social skills. If Ralph had listened to him, I think Jack and his group would have scorned him even more.
What is a quote from the book that says Ralph joins groups and seeks security?