It should end, at the very least, after they: 1) learn about the mystery behind the clear pacifier Bermuda and the Vindice 2) Tsuna truly takes over as head of the mafia world 3) there is some kind of time skip to show what they are all doing now
I don't think KHR will be ended in this arc since we didn't hear a news about it. There are still some mystery in the story that haven't been told yet.
Daemon remind me so much of Aizen right now..anyway I wonder if Tsuna will keep this new power up after the fight or is it just a temporary thing..I hope not cause it's kind of cool