Will that actually act as a pull-down when off, as the led diode won't be forward biased at that time, I don't see how it can have a significant electrical influence on the input pin to force it to a logic 0. I question if there might still be a floating input condition when switch is inactive? I would think a diode that was not in forward bias condition would just act more like a very small capacitance wired from the input pin to ground.
Lefty