#2 Reality TV crossover
Of course, there is going to be debate about whether this factor is a good thing or not, but try to think about WWE as an entertainment entity and not just as pro wrestling. In all seriousness, the company is publicly traded on the stock market and is doing everything they can to bring in new audiences.
And that's where The Bella Twins came in. Two beautiful women that had been with the company for almost a decade and were ready to share their life with the world. They showed us the good, the bad and the ugly of the journey and while there was a whole cast of co-stars, one could argue that the twins were the focal point.
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In the end, The Bella Twins helped to further WWE in the public conscious by staring in the Total Divas and Total Bellas reality show. That is what helped the company create more content for both the WWE network and the company's broadcast partners while also bringing it to the mainstream.