#3 It opens up the door for Seth and Becky storylines
I know that a lot of people may not exactly be open to Seth Rollins and Becky Lynch storylines, because it's so 'sports entertainment' and not 'smark friendly'. Let me counter this by saying that I watch Impact Wrestling on a regular basis who've pulled off this storyline quite well.
Even though Johnny Impact and Taya Valkyrie were heel Champions, the two of them played a power couple on TV making for some very interesting content. I love it when there's a crossover of some sort in terms of content.
And this is because no storyline can happen in isolation, as is often portrayed in WWE. We exist in a system and one thing generally influences the other.
This may only be the start of Seth Rollins and Becky Lynch storylines but in due time, I suppose we'll see a lot more similar storylines happen.