Ahhh you beat me to making this thread first haha. I was just about to, not even kidding.
And I think if everyone gets revived it will ruin the end of the manga. Here, so many people died just to protect Naruto and so many people died like Neji that gave so much emotion to the story, but then Neji and everyone else gets revived.....it'll seriously ruin a great amount of the ending because there efforts were all for nothing.
I think everyone's going to be kept dead though, if 40,000 people died just the first day, there's probably the most 25000-30000 ninja left, but they aren't even done dying yet. The ninja population will get so low that when the wars finally over, Naruto is probably going to end up being Hokage and create peace among the villages to rebuild the ninja world.