#2 John Cena has a segment with Mr. Money in the Bank
During his recent WWE run, John Cena interacted with several younger stars. We saw him put over Riddle during his appearance on RAW, Bianca Belair during SmackDown, guide Dominik Mysterio during tag team matches, and many more. He could do the same this week on the Blue brand with a segment alongside Big E.
Mr. Money in the Bank has been involved in some hilarious backstage segments with Paul Heyman on SmackDown recently, continuing to tease a cash-in on Roman Reigns. He could have a segment with Cena this week, where the latter puts him over and motivates him to cash in on Reigns for the Universal Championship.
A WWE Hall of Famer isn't a John Cena fan. More details HERE
#1 John Cena bids adieu to the WWE Universe with a promise to return soon
While all the previous four points would lead to some sort of storyline development for John Cena, WWE could always simply book him in a "Thank you, I will be back soon" promo segment.
Cena is one of the greatest WWE Superstars of all time, and his absence surely made fans realize that fact. The level of energy and passion that he brings to the ring is unparalleled and the fans will surely miss that now that he is gone.
The Leader of Cenation could simply bid adieu to the WWE Universe on SmackDown this week, teasing his retirement, only to then claim that he will be back soon, among huge cheers.