They already have, I think. The force touch trackpads don't move - they give the illusion of clicking using haptics. Don't see why keys would be much more difficult.
What I was referring to was technologies that give not just the illusion of some click but of physical texture before a key is even clicked. If your fingers can't feel the keys before you even click them, IMHO it's a no go.
Well it would have to be much, much better than any haptic keyboard I've used so far. Those that I've used may give feedback, but it's nothing like using a keyboard.
I'd bet they will be one-day, or perhaps they are in a lab, but they can't achieve it at-scale, or at an acceptable cost. It's likely why they're trending the existing keyboards towards a flatter profile -- in preparation for the sensation they know they'll be able to pull-off in 3 or 5 or however many years it'll take to deliver a haptic implementation on their products.
