You can't be sure that they'd have made a Warcraft 4 if they hadn't made World of Warcraft. And frankly, considering a franchise ruined because there's something in it you don't like is extremely ridiculous. Like people saying Indiana Jones is ruined after Indiana Jones four, or that the new Super Mutant Ninja Turtles film will ruin that franchise. If people think that something new coming out in a series will render the previous movies or games un-enjoyable... I don't even know... there's something seriously wrong with them.
