#1 Dominick joining Seth Rollins

As crazy as this might entry might sound, especially with WWE's intention of turning Rey Mysterio's son, Dominick, into the next big babyface, it's not really outside the realm of possibilities. In fact, WWE have turned Superstars heel in the past and used a change of heart moment to make them the biggest face in the company before.
Daniel Bryan shocked the WWE Universe by joining The Wyatt Family in 2013, and while many thought it was the end of any chance he had at the title picture, it only made him that much bigger of an entity. Furthermore, when he finally had that changing of heart moment, it received one of the biggest pops from a crowd in WWE history.
In the end, Dominick wants to protect his family and if Rollins can somehow make a deal with Mysterio's son in exchange for his father's safety, it would be brilliant storytelling. It would also set the stage for the aforementioned change of heart moment and help turn Dominick into a household name.