#4 Open the tournament to all brands
With the exception of WrestleMania, Survivor Series, SummerSlam and the Royal Rumble, WWE has made every pay-per-view exclusive to either the Raw or SmackDown brands.
If the KOTR were to return as its own event, WWE should not only open the tourney to competitors from both brands, but it should also include Superstars from NXT.
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Using the tournament as a way of pushing a developmental talent to the main roster would give that person a huge boost in exposure and show the fans why they should be cheering for him.
NXT has almost become more like a third brand than a developmental system. It's still where rookies hone their skills, but the TakeOver events are often more entertaining than the main roster PPV airing the same weekend.
Using all three brands for the tournament would also allow WWE to create some matches we have seen before so it can test the chemistry between two wrestlers for a potential feud. There's no downside to including Raw, SmackDown as well as NXT into the KOTR mix.