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So in a sense of not shitting up the place, they should. Like Undertaker should have been done after the WM29 Punk match. Don't think he had another great match after that. But crowds don't care about how good a wrestler's matches are, they'll pay just to see him do his spots. So it doesn't make business-sense if the guy can still move even if he's slow as shit and can at best have a decent match on a good night. Where the real problem lies is that these guys past their prime are still bigger names/stars than the current guys so you can't just have them hanging around in the opener doing tag matches.