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Lacking any evidence to the contrary, I would assume that the study from 1995 is still valid.  It comes from a very large amount of input data.  The distraction devices you mention are more prevalent today, but I would expect that to make the lack of the train horn more dangerous.  Clearly, those devices are distracting to drivers, distraction is a big factor in crossing crashes, and the train horn’s sole purpose is to break people out of distraction.  So it seems reasonable to conclude that the lack of a train horn becomes more dangerous as drivers become more distracted.   Thus overall, I conclude that the train horn plays a large part in the prevention of crashes.  For quiet zones, the question is whether the added danger from removing the train horn can be balanced by adding safety in the form of features that make it impossible to drive around the gate.  I don’t see how that balance can be possible because the train horn obviously prevents crossing crash causes other than just those caused by drivers going around the gate.  The train horn can prevent causes such as a driver falling asleep, for instance.
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