#4. No finish
These two teams have a lot of fire between them. Each member has their own reason to dominate in this competition and it could easily spill out into an uncontrollable all-out brawl. Therefore, what if after a decent contest, the referee loses all control of the proceedings and is forced to make the decision to call off the match?
If they spilled out into the crowd and set up some kind of sick spot in a prearranged area near the entrance ramp or in a backstage area, there could be little to no chance for The Shield or The New Day to make it back to the ring.
Corey Graves deleted his Tweet! More details HERE.
It would have to be something incredible, though; like a double tower of doom off the stage or something of that magnitude. But never put it past WWE to come up with an insane spot so their two top factions can still thrill fans with neither team losing any heat in the process.