>>2 Just because they haven't proposed it in laptops and desktops yet, doesn't mean that they won't. Remember, the US legal system is based on something called "precedent". They'd move the technology to laptops next, under the same premise. Then they'd add it to desktops and servers on the grounds of aiding law enforcement or copyright enforcement.
Also, keep in mind that a kill switch in phones can harm journalists, emergency calls, peaceful protesters, and the like.
Think before you simply dismiss opinions.
>>3 Actually, it takes a really strong (expensive) magnet to affect electronics, particularly phones, as they use flash memory instead of hard drives.