Just think about how different it would be if Wrestlemania was split up over the course of two days instead of having a ridiculously long event on one day. Now not much is known about how this could work, but I do think that this would be one of the best ways to fix the issues they have with the event. The only other way I could figure is by moving it back to being a three hour event instead of having it be a four hour event. However, I think knowing WWE they would never do that and would be more likely to add a second day for the event instead to fix the time problem.
Realistically there is more of a chance that at Wrestlemania 35 it will be just like any other event and that nothing will chance over the course of the next year. Imagine though going into Wrestlemania next year with two main event matches set for the two different days with one being for the Women's championship. Overall the possibilities are endless and either way this in my opinion is an interesting concept that I would love to see come to fruition in the future.