I wonder how far you can take such an argument. Oxygen masks? Decompression is pretty rare and seems to be accompanied by a fairly controlled rapid descent to where the lower pressure isn't a problem.
First aid kit? If it's fairly comprehensive, it needs changing every so often.
Fire extinguishers? How often is there a fire which the extinguisher in the cabin puts out?
I wonder what else the bean counters could come up with to save a penny...