Hmm... Not impossible and come to think of it, this was a future decided a long time ago on Star Trek TNG (they had no keyboards at all). Missing the tactile (I think I would, as a matter of fact, the only reason I bought a PowerBook instead of an iBook (I am still a lover of my PowerPC chip, there seems something so wrong about the ability to run WIndows on a Mac, but that is just me) is because I made the mistake of touching the keyboard in the Chicago Apple Store and I fell in love with way the keyboard felt, it is just dreamy. In comparison, the keyboard on the iBook felt cheap and plastic-iky.
But to toss another monkey wrench in future plans, think what an OLED screen would be capable of. Put that over something slightly cushy and you will have your tactile experience as well as something multi-configurable and brighter.
The New 12" MacBook Will Have an iPhone-like Interface