It's just like a soap-opera. A lot of characters come and go. Some, even main-event/major ones, only have 2-3 years worth of story to tell. Some might have a decade plus.
Bray is a perfect example - 2-3 years worth of good story & could have released him after that. WWE instead just hires and stockpiles people. A smaller, constantly cycled out roster would keep things fresh all the time. And you can always bring some people back, if needed, for another run down the line.
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