#2 A good in-ring match and lack of alternatives
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The thing with Becky Lynch is that she is not only superb on the mic, but is also one of the best in-ring performers in the company. She is agile, and is technically brilliant inside the ring.
Meanwhile, Ronda Rousey is a former UFC fighter and a natural athlete. Some might criticize her for botching moves here and there, thereby endangering her opponents by putting them at a real risk of getting injured, but she has improved a lot in terms of being safe inside the ring.
As a result, a match between these two is almost guaranteed to not only be entertaining due to the storyline efforts and emotional investment embedded in it, but will also wow the fans in terms of the quality of wrestling.
The only alternative to this is the match between Seth Rollins and Brock Lesnar, or someone against The Undertaker. In the former’s case, a part-timer shouldn’t be headlining WrestleMania and in the case of the latter, The Undertaker just isn’t the in-ring performer he once was.