I could see this happening:
Team Sting (Sting, Ziggler, Ryback, Goldust, Maddox) vs Team Authority (Sheamus, King Barrett, Rusev, The New Age Outlaws w/ Triple H and Stephanie McMahon)
Seth Rollins (c) vs Roman Reigns for the WWE World Heavyweight Championship
Charlotte (c) vs Paige for the Divas Championship
The Wyatt Family (Wyatt, Harper, Rowan, Strowman) vs Team Undertaker (Undertaker, Kane, Bryan and Ambrose)
Alberto Del Rio (c) w/ Zeb Colter vs Zack Ryder for the US title
Team Stardust (Stardust, The Miz and The Ascension) vs Team Neville (Neville, Cesaro and The Usos w/ Stephen Amell)
Kevin Owens (c) vs Damien Sandow for the IC title
The New Day (c) vs Dudley Boyz for the Tag Team Championships
Basically, I would probably just redo the HIAC Tag Team match because I can't think of anything better. Owens could fight Sandow and Del Rio could fight Ryder just because I want to see them pushed. I'd also like a return of the heroes vs villains stuff from Summerslam, where after Stardust loses, he freaks out and disappears. The Wyatt Family vs Team Undertaker could put Wyatt over big along with Bryan returning, as he has history with the Wyatts. Add in Charlotte vs Paige and Rollins vs Reigns, then I decided that Sting should lead a new charge vs The Authority, possibly adding a stipulation where the Authority loses power if they lose. This results in Triple H begging Rollins to lead his team instead of defending the title, but Rollins wants to fight alone. Triple H calls upon his old friends, The New Age Outlaws, and the Eurobeasts. Meanwhile, Sting asks Bryan to help him pick the guys who have been most screwed by The Authority, and we get Ziggler, Ryback and Goldust who want to beat The Authority the most. Then suddenly, we also get Brad Maddox, who has become a badass vigilante living in a cave in Mexico for months after being fired by The Authority. At the show, Triple H gets involved but suddenly, Cody Rhodes runs down and hits a Cross Rhodes on him, allowing Ziggler to pin Sheamus. Cody then abruptly leaves and on the next RAW, we see Stardust back, resulting in a double-personality storyline with Goldust trying to get his brother back. It also sets up a future Rollins vs Triple H feud and well, Maddox is established as a new midcard guy.