If I were to take control right now, the title scenes would look like this within a few months. I've cheated a little bit with Bayley, but she'll definitely be on the main roster by then
Full of plot holes and thrown together in 10 minutes ... but here's Champions plus main opponents.
Tag Titles:
Bullet Club (c) (Tweener)
Ambrose & Reigns (Heel)
New Day (Face)
Enzo & Cass (Face)
Dudleys (Heel)
Club goes nuts on Styles tonight on RAW for not being able to beat Reigns. Then they destroy both tag teams in an Extreme Rules rematch between New Day & Vaudevillans, forcing themselves into contendership for a title shot. They defeat New Day on their first attempt at MiTB, and they hold the titles until Mania.
US Title:
Rusev (c) (Heel)
Alberto Del Rio (Heel)
Zack Ryder (Face)
John Cena (Face)
Del Rio sucks up to Rusev now he's got gold. Cena returns to reclaim his US Title. Meanwhile, Ryder starts messing with Rusev and Del Rio backstage. Hitting them with practical jokes, making them look stupid, plus capturing them doing embarassing stuff on camera, posting to YouTube.
Shane places them in 4-way and tag matches, Del Rio and Rusev piss each other off, Cena gets pissed at Zack for inserting himself into what he considers "his" US Title hunt.
IC Title:
Kevin Owens (c) (Heel)
Sami Zayn (Face)
Cesaro (Face)
Apollo Crews (Face)
The Miz (Heel)
Dolph Ziggler (Heel)
The current 4 are killing it ... so, basically more of the same, but adding in more high flying with Crews and some HeelZiggler attitude.
Women's Title:
Sasha (c) (Heel)
Bayley (Face)
Charlotte (Heel)
Becky Lynch (Face)
Reworked NXT 4 Hoursewoman Angle, leading to Mania climax, with Bayley taking the title from Sasha.
WWE Title:
Seth Rollins (c) (Face)
AJ Styles (Face)
Randy Orton (Heel)
Bray Wyatt (?)
Rollins returns to take out Reigns. And succeeds, putting Reigns out with a kayfabe shoulder injury. Reigns trains back to healthy with Ambrose's help and they return as a tag team after Shane declares that Roman is "at the back of the queue" following his destruction by Reigns. They have a Bullet Club V Shield program, eventually getting the titles.
Meanwhile, Rollins and Styles have a couple of Face V Face PPV main events. Technical masterclasses with Rollins slowly turning heel again, leading to reveal of Heyman as Rollin's advocate. Flashing lights and weird promo shenanagans lead to Survivor Series where Orton returns to interfere in their rubber match ... you think HE was behind the promos, but when he's standing tall after attacking Rollins & Styles, lights out. Wyatt Returns - alone - to take out Randy. Wyatt cuts his usual promos. Let the fans decide if he's face or heel!
And Lesnar? Yeah, I fired him.