If Sasuke dies, all hell will break loose. They will have to keep his death a secret and hide it. I imagine people who seek power will attempt to go after his Rinnegan. Or if someone abuse the Edo Tensei again, Edo Tensei Sasuke will basically be a repeat of Madara. Except Sasuke is good, so they don't have to worry about breaking free from and cause a shit storm.
If Naruto dies? Meh.. Give Kurama to another kid and call it a day. Even if someone revive Naruto all he will have Sage Mode. That much the future gen can handle. The fact Naruto doesn't have any super secret Ninjutsu make him the least Hokage to be target. Unless we're talking village secrets.
Overall, if Sasuke dies, the Ninja World will once again go back to war.
If Naruto dies? Meh.. Give Kurama to another kid and call it a day. Even if someone revive Naruto all he will have Sage Mode. That much the future gen can handle. The fact Naruto doesn't have any super secret Ninjutsu make him the least Hokage to be target. Unless we're talking village secrets.
Overall, if Sasuke dies, the Ninja World will once again go back to war.