Now I don't quite follow you.
If you do not take eyeshots while KO, you'd have to take multiple good crits before it to really die.
That way people would have much less reasons to worry about moving into line of snipers ultimately favouring fast rushes than any further planning.
We already know that crippling and even aiming eyes will be much bigger deal after update, there's little need to suggest making it even less threat as it is now.
Because there's no way we'd get anything from tactics any time soon if ever, it'd be still wiser to update maps with some more props to cover people than just making whole danger of dying at range more marginal.
I personaly do not play or ever tried to play any character that can use sniper rifle or gauss pistol, but I always liked the idea of killing fields where you can't just walk somewhere, where it is watched. Though instakills were silly, KOs would make more sense, especialy if for example they could be removed by FA or chems.