the whole point of suppression is that if they pop out of cover you shoot them in the face so they stay in cover till you stop shooting at them, not that their eyes stop working for some bizarre reason.
The point of suppression is that you do not WANT to come out of cover, because you will die.
Have you every shot a gun? Or had a gun shot at you? I've been to a firing range and shot a variety of guns including an AK47, and there is no way in hell that I would be able to come out of cover when being shot at by any of those :s let alone come out of cover and pop off accurate shots.
If you have no fear of death (this is a computer game) then what's to stop you just poking your head out, picking them off, then getting shot.
In the real world, if your cover is being shot to **** then there is no way in hell you will get up, bullets whizzing over your head, fear of death, all the things that are hard to re-create in a game world.
Therefore they have added screen blur, jilted aim, bullet pops.
Id like to see you, in the real world, while taking fire, while being suppressed, to just pop up and shoot them in the face. (I find it hard enough to come out of cover in airsoft when under heavy fire, I cant even imagine doing that in real life!)
Go and play Darkest Hour (Red Orchestra mod).
Its a WW2 western front game, when getting shot at really does put the fear of god into you, your aim jumps, bullets pop and fly past your head, suppression really does work cause one wrong move and you're down. (your aim doesn't jump when you're actually solidly behind cover, but if you stick your head out it does)
It doesn't make you go "blind" as you so "accurately" said, but it does do a very good job of keeping your head down!
Go and watch the fault line video for BF3, when they are on the roof getting shot by the sniper, see the slight blur? Imagine that, but with a much higher rate of fire.
Oh and Tefal, they are stopping quick scoping, but long range sniping will be more skill-full, not impossible.