What SE (has been) and publishers in general nowadays to do is not worry about how to deal the next big blow to WoW but to create a game that their playerbase thoroughly enjoys. I could care less if it deals a huge blow to Blizzard and they lose x amount of subscribers to (Insert game here) if the content isn't something that I enjoy. I imagine if we as a gaming community quit with the "for WoW" or "against WoW" camps that developers across the board will start putting out more original and meaningful content and we'll all be better off for it.