#4 It would help to give birth to new stars

WWE is clearly high on Mandy Rose (and hopefully that's not just because she's easy on the eye). Sonya Deville, also, has a lot of raw potential. Though they would be secondary players in this particular drama, being involved in a prominent WrestleMania program would certainly help to elevate the two of them, getting them exposure and experience at WWE's highest level.
Eventually, when Paige's stable breaks up, they'll be in a better position as they go their own separate ways.
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With this element also added, Paige vs. Asuka at WrestleMania is smart booking both for this upcoming season and the long-term future of WWE's women's division.
Here's hoping that it happens.
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