Should not end the brand split: It's only been two years
When it comes to television programming, executives have learned that messing with the status quo is a double-edged sword.
On one hand, shaking things up tends to draw a lot of attention, at least temporarily. Media and fans alike tend to tune in just to see what form the 'bold new direction' will ultimately take.
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On the other hand, you take a massive risk of alienating long-term fans by changing the essential elements of what made the entertainment appealing in the first place. Shows like Ally McBeal, which changed from an hour dramedy to a half-hour comedy, know this all too well. Heroes is another program that kept changing gears too swiftly and didn't give its fans time to settle in.
The current iteration of the brand split is only two years old. Ending it now would seem jarring to fans who have just gotten used to it. Also, some fans have only recently started watching WWE, and the brand split is all they know. Changing it up could cost WWE both long-term and new fans in the long run.