Why won't smaller, more efficient chips be usable as miners?
I just told you twice. They do not remotely compare to Bitcoin ASICs, and you only want see the magic "SHA-256" word.
We have a professor of Comp Sci who says they will be.
Hilarious.
I'm aware they won't be as powerful, per unit, as mains-powered ASICs. (Although they will be more efficient in hashing per watt.) They're mobile chips. That's not in debate.
Why does that make them unusable?
How on earth is a 14nm general purpose SHA-256 ASIC going to be more efficient that a 14nm ASIC designed specifically to mine bitcoins?
What you are saying makes no sense.