The Man vs The Baddest woman on the planet

If women were to headline WrestleMania, this is the match. The match of such magnitude is definitely worthy of the main event status.
If WWE eventually decides to pull of this match at WrestleMania, they can even make Becky participate in the Women's Royal Rumble while holding the SmackDown women's title and can eventually go on to win it making it a double championship match possibly at the main event.
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This two ladies have worked hard to reach the top of the mountain in their own separate ways. Both of them might not have the same story but the fire needed to make it a main event match is incomparable. While Becky's jump to the top has been a joy to watch, Rousey's improvement in terms of both in ring and promo skills has been commendable. She has been portrayed as a man possessed inside the ring whereas Becky is being shown off as a real badass.