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On most replays you can't really see the ball.
But you can see one ref, not screened by the players, looking directly at the ball and not signaling touchdown, and another ref, apparently screened by the players, not seeming to be looking directly at the ball, and signaling touchdown.
And not only are they simultaneously making opposite calls, the guy with what appears to be the worse view is the guy whose call prevails.
To the casual viewer, that says "chaos", "clueless", "no one is in charge here" -- whether the actual technical rule interpretation is right or not.
I think that's the visual that doomed the replacement refs.