I hadn't seen this poll for a while. Wow. Those are pretty clear figures, though there should have been an option for 'user selectable', I guess.
When engaging in discussions with people in threads about this change, it feels more 50-50, and those who like having a hardware mute switch will tell you in no uncertain terms that, like, everybody needs that function, dur.
The counter-point might be, try this poll again in 6 months' time once everyone's got used to it and you have a bunch of new users who have never known any different. But the poll should be worded: do you ever use the mute switch?
My hypothesis: iPad 2 will have no switch.