#1 The Undertaker's legacy
At the end of the day, its all about legacy.
Unfortunately for The Undertaker, his legacy has been bogged down quite a bit over the last couple of years and his recent string of matches isn't helping things at all. In fact, his match against Triple H at Super Showdown was probably Taker's worst match in years and it accomplished nothing!
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With that being said, that's no way to continue the legacy of one of the most decorated stars in all of sports entertainment and WWE should be ashamed of themselves for even attempting it. In the end, it hurt Undertaker's legacy to have this match and so will any other match he has in the future.
In all honesty, he just can't go anymore and he shouldn't even be expected to. The man is in his 50s, is still nursing life to change injuries and shouldn't be put in a situation where he can accumulate more. Maybe WWE will hopefully learn the error of their ways and never do another Undertaker match again, but WWE might feel content to just beat a dead horse.