I agree watching those two die in the last episodes made me wish somehow things had been different. And this is a way it could have been, but then we wouldn't have a story. 
she was going to die, so the kyuubi would go along with her, then resurface later on. that would weaken konoha's military position.I know this is an anime and not real life, but in terms of practicality, I actually think there should have been some kind of evacuation of the villagers, at least for the normal non-shinobi citizens.
Also, I'm not entirely sure why they couldn't have resealed kyuubi into kushina. As long as she doesn't get pregnant again the seal wouldn't reweaken.
Exactly!You have to think about it this way...if they were there that night, then we wouldnt have the great story line that we have now.
lolExactly!
But if they were there during the attack, Tsunade would have sealed it into herself and we would have "Tsunade" the manga, not "Naruto" lol, just kidding.