Meh, I think it would only turn out to be sappy, just like Aeris when I first saw it (granted, I first saw it in 2006 and was spoiled by then) and have no impact. Even Chrono kicking the bucket did little to me since he could come back anyway and had no personality.

The only time I actually became quiet by a death in FF was Aria in FF III and Galuf in FF V. Nothing will ever be able to top Galuf's going. Epicness in phyical form right there.