Higher profits for Apple, lower profits for insurance companies
I foresee one outcome of this being a lot more electronic devices being "lost" or "stolen" or "dropped". Rather than claim back on warranty - or consumer laws, people who fiddle with their kit and break it will now just claim on their insurance, or credit-card cover. All that's happening is Apple are reducing their insurance costs, while keeping the goods the same price and passing on the risk to people who buy their stuff: a price rise by stealth.
@Oliver Humpage Three letters: ESD. Remember this is just phase #1. Next will come the idea that if it was opened, it should have been done by a qualified engineer, with a certified anti-static regime (read: Apple approved outlet). Otherwise opening will be deemed to have zapped something, which will void your warranty. This isn't such a new idea: we've all seen these labels on disk drives and no-one expects to take one of them apart on the kitchen table and be able to use it again afterwards.