Have absolutely zero desire to see a multiplayer or co-op mode in Infamous SS, too many games force it, too many games have a shell of a SP campaign to spend all their time on MP, and quite frankly, developers focused solely on SP only, or MP only, will make a better overall product.
Had Rockstar not spent so much time on the MP, who knows how big and detialed GTAV's SP could've been. I know, many people don't like lengthy story lines (be gone you scum!), but I do. And if you need MP/Co Op in every game you own, buy something else.
That having been said, I want the vision Sucker Punch had for this game, not what people want to force them into making.