You can never completely idiot-proof anything, because they keep turning out bigger and better idiots! [Linked Image]

But I think that there is a difference between idiot-proofing and protecting against a reasonably forseeable circumstance such as the one I cited. Especially when there is negligable cost or labor differential involved here. Just take the feed from the GFCI circuit, which will already be IN the bathroom due to NEC requirements.