#2 Heel Turn - The New Day

This one will likely not happen as long as Kofi Kingston is the WWE Champion. The group started off its faction-life as a group of heels trying to change the status quo. After routinely using their one-man advantage to interfere in matches, their collective charisma was just too good not to turn them into lovable faces.
It's been nearly four years as the top faces in the tag division but in those four years, they've routinely provided the best promos of the night. That's all well and good, and Kofi's "Power of Positivity" is a good lesson to teach the younger ones, but they'll be missing out on a great storyline whenever the group disbands.
Who knows? Maybe they might stay together until they retire. But turning them heel would not only allow another team to move into the spot as top face team but also allow them (or a member of two) to challenge other faces. The group is too valuable from a marketing standpoint to be heels, but the disbanding of a team or faction is always money if done right.
Becky Lynch has been challenged HERE.