I actually had thought about this before, and yes it does seem a way to make it a lot fairer, especially if paire with LOS psi, which means maneuvering your psi soldiers would be a lot more difficult and require clever logistics.
On a short side note, I would also like to support making psi-capable soldiers rarer (by making 0 psi hability soldiers occur) and rather make it possible to train psi power instead of psi-hability. This would mean that even soldiers with bad psi resistance could be trained in the lab to at least being able to resist psi control, whereas psi hability would be immutable throughout the whole game, and only good psykers would have a chance of success.