I like Elvira and campy horror stuff in general (TFTC), but agree there is no need for another Elvira pin at this point in time, when so many other great theme ideas haven't been explored yet.
But... it is a safe bet to make one, and sales are baked into the pin community already, so it will be made just like all the dinosaur rock pins keep being made. So I understand why a new one would be made from a sales perspective. As long as pins are selling, all is well. I'd just like to see some fresh material.