Because that totally wasn't the case with Death Knights, right? Yes, there will be a thousand of DH's at the start, but overtime they will slowly start disappearing. You know why? Because not everyone likes being a melee DPS or a Tank, and those people will be the first to quit. On top of that, guess which class the Demon Hunters are the closest to in terms of gameplay? Rogues and Monks. And which class is the most underplayed as of right now based on countless statistics that we've had over the years? Rogues. I'm actually willing to bet DH hype will die down faster than the DK hype.