Sensors are obviously important, but it doesn't really matter if two sensors conflict, the important thing is which one is consistent with their running model.
So far their biggest problem is that they allow flicker. That's why sometimes the software picks the wrong lines. (Of course this is a very hard problem. Our brain conveniently smooths over sensory changes for us, because that's how our everyday reality is. Things don't flicker in and out of existence, nor does a car suddenly appear as a different thing, then switches back.)
And if it turns out the sensor(s) failed, it has to be able to handle that too.