You still have a silent mode toggle on your iphone. I think apple can figure out how to add a hardware switch for a camera/mic to a laptop without compromising thickness.
It doesnt need to be a hardware cover, just a hardware killswitch to the circuit.
Well, I can't speak to Apple's intentions, but consider they did the same thing with their laptop touchpads as they did the iPhone button. The touchpad used to actually depress, now it just vibrates to simulate feedback.
(Thinking about this again, past the edit window—no, it's more than three parts. There's the (1) sleep/wake button, (2) (3) the two volume buttons, (4) and the vibration motor. And I guess (5) the speaker too, not sure if it counts. Still, it's not many.)
It doesnt need to be a hardware cover, just a hardware killswitch to the circuit.