Good thinking man thats a fair point , altho i very much doubt it will happen think how rarely you hit you foot on a chainstay then think about how far inwards the wheel is compared to that , you would have to have your feet at 90 degrees to the pedals to get any where near it
I have rub marks on my seat stays on both sides.... where I think that they have stopped shoes shoe laces, pants velcro straps from my shin pads etc. from hitting the spokes.... I owe it to my right leg to never get a mono swing arm bike.
That's a really good point, there's nothing from stopping you loosing a couple of layers of skin to those spokes!
especially if you had aero spokes. haha