A ranking system
This is an idea that TNA implemented successfully. The main reason why WWE need such a ranking system is because of all the random matches they have. Raw usually has a string of filler matches that make no sense whatsoever.
However, if there is a ranking system, the superstars would be fighting to improve their ranking.
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That is, there will be an actual purpose for each and every match in the card. This could also amp up the excitement and intrigue among the fans. The contenders for the championships would be determined clearly using such a system as well.
It is a concept that could work if implemented in a solid manner, but at the same time, the room for error is pretty low.