#1: No Part Timers

Every WrestleMania main event in the last seven years has featured a part-timer. 2011 was the last time when two full-time superstars featured in the main-event of Wrestlemania. The Miz and John Cena competed for the WWE Championship, and ever since then, a part-timer has headlined Wrestlemania.
Although the fans will mark out for a part-timer like Triple H, these part timers are not the future of the company. In ten years, when superstars like Triple H, Undertaker, Brock Lesnar, etc. will not be around, who will main event?
WWE's inability to create superstars has created such problems and WWE need to rectify it as soon as possible. The WWE Universe wants to see superstars like Seth Rollins, AJ Styles, Daniel Bryan, etc. main event the Biggest Show of Them All, not Brock Lesnar.
If WWE is listening to the fans, then we shall have a proper main-event at Wrestlemania 35!