#2 He is the hottest commodity on RAW

A saying goes - strike the iron while it is hot.
WWE has dropped the ball with many wrestlers in this aspect. WWE has failed to capitalize on the humongous popularity of Braun Strowman as well as Rusev, and at the moment, both of them are struggling on their respective brands. Braun Strowman is in limbo, whereas Rusev is in an undercard feud and kick-off show matches.
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WWE cannot afford to do this mistake with Seth Rollins, especially due to the fact that there is a void at the top of the company.
Rollins has been putting forth brilliant matches week in and week out, cutting some amazing promos (especially the one against Triple H a few weeks ago), and has the support of millions of WWE fans.
With him being one of the best performers in the company, WWE does not have a more optimal choice than Rollins to dethrone the beast.
A top WWE star is missing in action