I think the real problem is that they tried to make it a final chapter at all. And I'm not just saying that I feel that way personally (I do, and it's okay if other people like it being so), but that it's what's got the fanbase all tilted. It was just too soon, for many.
But I think (most) everyone will calm down once we get another film or two to fill up the empty spaces left in Batman's abruptly finished career - even if it won't be Nolan's canon.
It's just about realizing that Batman's not over.