I am not sure about who should win this.
Vaudevillains surely need a big win for gaining credibilty. New Day have been tag champions since a long time. So I think that Vaudevillains need the win much more considering that they are heels and New Day is face now.
If New Day would have been heel, I would have have wanted Enzo/Cass to defeat them. But since they are faces now, Vaudevillains can be the right choice to dethrone them.
Infact it is only choice WWE has. Enzo is injured so Enzo/Cass is not possible. I don't want & see another Usos' tag champ reign. Dudleyz are just lurking there. Lucha Dragons isn't possible too. PTP is also not possible. Maybe Primo & Epico? Just maybe.
So I conclude that we should get new champs via some heel tactics like debut of Vaudevillains' manager, etc.