The problem with those "counter plays" is that counterplays can in turn be counterplayed.
CC him? QSS/Cleanse.
Focus him? What about the Darius that is charging at your ADC? Focusing is not a valid strategy because this gives the enemy an opportunity to place bigger threats on the board.
Burst him? His Q is like a Shaco ult level dodge that lasts a bit longer and gapcloses like Shaco Q. If he goes Defensive item after his BORK, this becomes infinitely more difficult.
What if we ganged up and killed him? Not too terribly efficient, considering that they still have 4 other threats on the board.
My argument is not that removing YI is impossible. Of course not. Nothing is impossible.
My argument is that removing YI is a very costly task. There is no efficient way to kill a skilled YI (if you believe in such things). They can 4v5 you because you're terrified of using your valuable CC. Rightfully so... if you waste it, you'll regret it.
YI isn't a shitty minion that you can just 'Entropic Decay.' He's got spell immunity, frenzy, flying and %maxHPdamage on steroids.
On a side note, it IS possible to outrun a yi with GHOST on TEEMO.
I should main YI. I haven't bought him out of spite, but I think it's high time to ride the train before the nerf hammers start slamming.