ijjysmith
Calm
They wouldn't fire Cena - he makes them a wedge in merchandise. It's probably the same reason they don't bother freshening up his stale character in any way whatsoever. The kids lap him up (not in a YewTree way).
I think if Cena started kicking off and being a bell about stories and that, then they might.
But he won't ever do that, so it's a moot point.