#3 Need time to build another face

Roman Reigns was in the main event of last four WrestleManias without a hiatus and was believed to headline next year's WrestleMania alongside his cousin The Rock. This move of WWE clearly hinted that they wanted him to be the next face of the company after John Cena.
When Roman defeated Cena, his victory was seen as the passing of the torch. WWE was building Reigns as the face of the WWE for a long time, but after Reigns' heartbreaking exit WWE now a new face to represent the company till Reigns makes his return and for that they need time.
Though the company has some top guys like Finn Balor, Braun Strowman, Seth Rollins, AJ Styles, Drew McIntyre and many more who will be worth the position they still need to build them up.
So the question is, who will they pick up as their next guy and what will happen to him after Reigns will return?