#3 Let nWo win the top championships in each brand, with John Cena only wrestling on PPVs
Winning the world championship in each brand will not only make nWo dominant, but it will also make the faction more hated. John Cena with the WWE Championship on RAW, Shinsuke Nakamura with the Universal Championship on SmackDown, and Finn Balor with the NXT Championship on NXT would allow nWo to control all three brands. Bringing in the nWo name to each brand will surely bring in more viewers, especially the hardcore wrestling fans and old WCW fans.
When Hulk Hogan was a member of nWo, he would mostly wrestle on PPVs due to his deal with WCW. Since Cena has a limited schedule with WWE because of his acting career, it only makes sense for Cena to wrestle only on PPVs.
Also, viewers would surely tune in for PPVs since that is the only place they can watch Cena wrestle. For years now, Brock Lesnar has been the special attraction for big PPVs and John Cena could very easily do the same job.