#3 Interference from both Kane and Shawn Michaels, culminating in a No Contest
Suppose the referee loses control, or gets taken out, prompting HBK to interfere for Triple H, and subsequently Kane for The Undertaker. Both Triple H and Undertaker have survived multiple finishers by this time and are exhausted.
Shawn hits The Undertaker with Sweet Chin Music after he was about to go for The Tombstone. Kane comes in and tries to Chokeslam Shawn, but Triple H stops him. They try to double team on him, but as he is too exhausted, and Shawn is out of touch, Kane gets the better for some time and Chokeslams Shawn through the announcer's table.
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He comes back in the ring to face Triple H who tries to hit him with a sledge hammer but fails. Kane tries to go for a Chokeslam, but Triple H low blows him and Pedigrees him on a chair. He then goes for The Undertaker who is still out.
Undertaker catches him into Hell's Gate, and Triple H starts to fade. Fortunately just before he would give up, he grabs the hammer nearby and strikes Undertaker. The Undertaker releases the hold, but Triple H has also faded. All four men are out. A new referee comes in and declares the match a No Contest.
This or any similar finish would lead to a tag match at Crown Jewel, but at the same time would be the second consecutive pay per view main event with an inconclusive end. Therefore, I don't think it would be the best finish.