Here's what I'd go for:
Kane V Big Show v The Yeetay! in a Buff Bagwell's mum on a pole match for the strap, bro.
or......
At the Rumble I'd have Reigns come in early (perhaps no 1) and dominate, eliminating a stupid amount of contenders along the way. Around the midway mark Finn Balor comes out, Balor does extremely well also and makes it to the final 6. It's now between Reigns, Balor, Ambrose and Owens with two entrants still to come. It's looking likely that it'll be Reigns and he's all set for the obvious win on the road to mania and then the number 29th entrant comes out and it is none other than a surprise returning John Cena, the kiddies wet themselves and smarks sigh as he will clearly win the fecking thing.......that is until the buzzer for the 30th entrant goes off and outcomes Brock Lesnar, who is another surprise entrant. For the first time in a long while this may actually create genuine intrigue as to who will win the Rumble with 6 potential winners as the final 6 (usually there's one or two obvious "they'll never win"....*cough* Big Show *cough*), Ambrose and Owens eliminate each other setting up their match at mania......it's the final 4 Reigns, Balor, Brock and Cena, each of them in a corner, it's at this point that the lights go out and the infamous gong sounds, the lights come back up and The Undertaker is standing in the middle of the ring, surrounded by the 4 wrestlers, "this is awesome chants" fo sho, Taker looks at Reigns and then at Brock and then Cena, finally he stares at Balor, points at him, Balor runs at Taker to drop kick him, Taker swerves, grabs, Tombstones and then Chokeslams him over the top rope.....the lights go out......the lights come back up and Taker has vanished. It's the final 3, Reigns, Brock and Cena - at this point the 3 proceed to batter one and other, no one is getting thrown over the ropes, people slide out the ring to grab weapons and beat each other to a pulp, it gets to a point where all 3 are down and struggle to get up, it's been like 20 minutes with the final 3 trading viscious moves and at this point Vince McMahon comes down and claims that for the first time in Rumble history that there won't be a winner as it's evident that they could be there all night and deems it a tie. Setting up a 4 way match at mania. That finish may need work but if it's possible could be awesome (in my humble opinion).
^^That alone would provide tons of much needed pops^^
Mania 32
Main: Sheamus (c) vs Brock vs Cena vs Reigns
In a time when ratings are at a low I would stir things up by finally having Cena turn heel in this match and winning the championship in the process. Creating a huge WM moment and eyes will be back on the product just to see how this pans out.
Rock V HHH (if poss)
Taker V Finn Balor
Owens V Ambrose - ladder match
Bray Wyatt (who's now been banished by his family) V Braun Strowman (the new leader of the family)
Sasha V Charlotte V Paige - submission match
Some sort of 3/4 team tag team match New Day are a must
Andre the giant memorial thing (have it on the main card if poss) with Ziggler, Kane, Show, Breeze, Rusev, Barrett, Neville and the rest.