#4 Title unification
For as long as there are two separate main roster brands, it makes sense for there to be two separate sets of titles for talents to pursue.
Each brand has its own top prize between the WWE and Universal titles, while the Intercontinental and United States Championships offer next tier down prizes for each roster to pursue. Separate women’s and tag team titles further make each brand feel more or less equal in terms of opportunities to capture gold.
With two rosters, the volume of titles would quickly become overwhelming, not to mention confusing when, for example, the only thing to distinguish the women’s titles is which brand they fall on.
At a minimum, we could expect the women’s and men’s tag team titles to be unified. Additionally, unless the Universal Championship is going to remain more pointedly in the hands of part-timers like Brock Lesnar, it would make a good bit of sense to bring the world titles together, too, to leave a single, unambiguous top title for talents to pursue.