What should have been done about Colossus from the very start

instead of nerfing it into oblivion and leaving everyone wondering why it is still in the game in such a trash state after all the nerfs, what Rito should have done is this:

-Gain a shield for 20 - 190 (based on level) (+ 7% maximum health per nearby enemy champion HIT BY THAT SAME CROWD CONTROL ABILITY) for 4 seconds after hitting an enemy champion with hard crowd control (30 second cooldown).

instead of getting a huge shield based on how many people are around, you get big shields only when you actually CC multiple people eg a 4 man Xin Zhao ulti, or a triple knockup on Malphite etc. then you cant have stuff like Morgana proccing full 5 man shields with a single target bind. Or WW should get big shield when he terriefies multiple people not when he suppresses one target.