Luffy is still alive and kicking in the manga. The story keeps evolving with him at the center of the action, encountering new enemies and growing stronger.
Hinata would be heartbroken. She has always loved Naruto deeply. She would probably be in a state of shock at first and then mourn for a long time. She might also try to keep Naruto's legacy alive, perhaps by teaching his ideals to the next generation of ninja.
Honestly, I have no idea. The outcome for Carl could go either way. Maybe there are hints or foreshadowing in the recent comic issues, but I haven't kept up with them to know for sure.