Much as I loved Dumbledore, I really dont like 'cop out' deaths, where the death is used for emotional purposes and then just undone to make everyone happy again.
Thats where JK has earned so much repsect from me, cause its showing that we may think the magical world is a magical wonderful place, it really isnt. It has life and death just like the real world. The fact that Sirius died really blew me away cause I adored him (dreading the movie) and I was angry, got over it. Then Dumbledore died, another blow for me. But the fact that hes dead and not coming back is good, JKs showing reality in a magical world.