I just don't want Reborn to end, is all. But there's a great chance of an Arcobaleno arc after, that's for sure.
Going by the rules, this is supposed to be the only battle that will be fought - though we all know that's not going to happen. Only person that can stop Byakuran is Tsuna. My guess is that the Vongola wins this battle of Choice. Byakuran, pissed, says no and attacks the Vongola head on. Then it'll just be an all out brawl. Me likes.