While part of that is true, it would seem like they should have been opposite.
You're correct that the reason Superman was killed off was due to the Lois and Clark wanting to do the Marriage thing first, however that means they probably had to scramble more just to make a solid story. Yet it worked. They made some amazing stories that have only more recently being resolved (IE Hal Jordan and the destruction of Coast City).
Batman didn't have anything to do with a screwed up storyline. Grant Morrison pitched the idea of killing Batman a long time ago and it got approved. He said he had had big plans and that everything he has done was what he had had for this grandiose idea. Yet somehow it feels rushed even though it was all planned out. I was really hoping for some great stories. What I wonder is that Grant Morrison had this big idea and then DC saw that Batman's sales may have dropped for a second and were panically saying "WE CAN'T DO THIS!! BRING HIM BACK, GRANT" or something to that effect...
Regardless, if you had made huge plans then it shouldn't have felt as rushed as they did to bring the character back. Let the death Simmer, I always say. Look how long Jason Todd was gone!