You mean Zelda fanboys don't care about other action-adventure games.
Zelda fans will try other action-adventure games.
In fact I will go as far to say that gamers try other games that aren't stuck to a successful brand.
Hype is needed, but the hype we talk about is only from forums, gaming sites, and well that's pretty much it. Which isn't enough to properly sell a game.
We know that.
It is actually something that bothers me is that developers know that too, but why they just don't market their product to the outside world is beyond me i.e Madworld, etcetera etcetera.