#1 Bayley vs Sasha Banks culminates at WrestleMania 37
The primary consequence of Sasha Banks winning the RAW Women's Championship from Asuka at Extreme Rules would be the delay in the payoff to the storyline between her and Bayley. It would have happened at SummerSlam, initially scheduled to take place in Sasha's hometown of Boston, but a story as epic as this certainly deserves a crowd to witness its conclusion live.
That could happen at WrestleMania, with Sasha Banks and Bayley carving their own spot on a presumably stacked card. With all the time and effort put into it so far, a match between the two best friends would likely be one of the featured matches on the WrestleMania card.
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With Banks as RAW Women's Champion, she would remain on the Red brand once she and Bayley lose the Women's Tag Team Championship. Upon losing the RAW belt, The Legit Boss could enter the Royal Rumble and win it, moving back to SmackDown and challenging Bayley for the Blue brand's title.
WrestleMania would be the perfect stage for Sasha Banks and Bayley to finally have their marquee match on the main roster, with their only concern being possible time constraints. As long as they get around 20 minutes of in-ring time and grand entrances to commemorate the occasion, it will be fine.
Things would certainly get very interesting in the Sasha and Bayley camp if the Legit Boss comes away from The Horror Show at Extreme Rules with the RAW Women's Championship. It might eventually lead to a WrestleMania classic between them.