#5 Many Champion vs Champion matches

This week's SmackDown saw SmackDown Women's Champion Bayley and NXT Women's Champion Charlotte Flair go at it in a much-advertised Champion vs Champion bout. The Brand invitational will blur the lines between the brands, allowing WWE to have champions from different brands clash with each other at a show not named Survivor Series (more on that later).
As seen in the Bayley/Charlotte bout, these Champion vs Champion matches can put over the winning Champions in a big way, also giving room to the company to build a storyline upon the other Champion's loss. Any show advertised for a Champion vs Champion match is sure to garner attention from the fans, which is something WWE desperately needs in this period of all-time low ratings.
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The company is sure to explore every Champion vs Champion possibility, using it to their advantage. While this is mere speculation, there is a possibility that these Champion vs Champion matches lead to the unification of some titles as well.
Given the shallow tag division (both men's and women's) right now, it wouldn't be a bad idea to do so.