It’s good for the roster
Like it or not, Roman Reigns is one of the top talents on the WWE roster, especially from a booking perspective. Excluding the time period surrounding his suspension last summer, very few – if any – of the men regularly on WWE programming have been allowed to beat Reigns cleanly under any circumstances. As a matter of fact, Reigns has come out on top of feuds with three of the last four WWE Champions on the SmackDown roster – Dean Ambrose, AJ Styles and current champion Bray Wyatt – and former Universal Champion Kevin Owens needed help to come out on top against the Big Dog.
What does this mean? It makes all those top-tier talents look weak by comparison if Reigns can’t beat an aging Undertaker. Because of all those wins Reigns has stacked up in recent years, any loss stands out that much more for Roman than it does for any other talent. On the flipside, Reigns being the one of the first week-to-week performers to get the best of Undertaker in years could pull up the rest of the roster from a perception standpoint when they do inevitably beat Reigns or at least give him a challenge.