So the WWE has to fill up a 100k stadium next year. If I were them I'd be planning ahead right now because I can't possibly imagine anything they do drawing 100k.
Hypothetical Card
The Rock & Ronda Rousey vs HHH and Stephanie McMahon
John Cena (US Title) & Hulk Hogan vs Rusev & Roddy Piper
Brock Lesnar vs Kevin Owens vs Samoa Joe
Roman Reigns (RR Winner) vs Dean Ambrose (RR Winner) vs Seth Rollins (WWE Champion) [Seth spends year running from Dean & Reigns, who deliberately eliminate themselves at the same time in the RR so they can both get a shot at Rollins]
Daniel Bryan (IC Title) vs Finn Balor
Not sure if Taker and Sting will be involved, but could have them tag team together to face a dominant heel tag team.
The max capacity of the stadium is 105k, and the biggest event there is 104,793 people coming to see the final George Strait concert. I think they are going for 100k+, since the Strait concert can have a set up that takes up less space than WM.