#3 Add NXT to the mix

This is the most far-fetched suggestion in this list simply because the top stars of NXT have to wrestle in NXT Takeover: Wargames on the previous night. However, if they are added, the matchmaking possibilities are endless.
Intercontinental Champion Seth Rollins, taking on NXT North American champion Ricochet. WWE champion AJ Styles taking on NXT champion Tomasso Ciampa are dream matches on their own. RAW women's champion Ronda Rousey and the reigning NXT women's champion Shayna Baszler are good friends in real life and on kayfabe. A match between those two former UFC fighters would be interesting as well.
Look who just shut down all of Tony Khan's critics! More HERE.
Overall, adding NXT to the mix would only improve the quality of the matches as well as that of storytelling. Having Triple H monitoring the creative directions would enhance the quality as well. Thus WWE may include NXT in the mix.