Assumption: people who want to listen to stuff usually have an iPod (or equivalent)
Let's talk Steve Jobs into sponsoring a standard which would use low-power FM to broadcast to a common channel that iPods would be able to receive. Then this could be used for displays like the above, as well as in museums, theatres, and in other places that have broadcast for hearing aids (like the Quaker Meeting I attend), etc. The iPod++ should pick up one or more of the frequencies already used by such systems. So not only would people with this kind of iPod be able to get hearing assistance in a variety of places, but the rest of us wouldn't have to listen to the extra noise generated by these displays.
Just a thought....
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