no, you're missing the point. the subwoofer is not connect to a wall that vibrates, so it wouldn't miss the signal. the surround speakers and possibly the front and surround speakers tend to be attached to a wall. The floor doesn't shake enough for the sub to loose alignment is the point.
Well, (to treat this seriously, rather than the joke it was) where's your transmitter? And are there vibration-sensitive components inside of either the transmitter or receiver? Several times a month, cars idle outside my apartment with bass loud enough to severely shake my windows, and somewhat shake my walls and floor. I imagine a receiver that's physically attached (or merely very near) to a subwoofer that loud would have trouble maintaining a steady optical link.
Also, if you bounce the signal off a mirror on the wall like DIY Perks did, then walls vibrating even a little bit will be an issue if the beam is narrow enough.