Oh I hope not. I turned off all the fake noises on my Lumix as soon as worked out that I could. I want to hear the actual mechanical bits functioning, and a little P&S shouldnt be making mirror flying up noises anyway.
I think in very short order people will get attuned to the noises that it does make, but something user-operated - like the horn but less strident might be a good idea. Sort of the equivalent of a subtle clearing of the throat to ask someone to move.