I wasn't here when it happened :'D Sorry. But I also don't see how it got so derailed. Last time I was here, it was on point.
That aside, Naqel has made the most logical and cohesive point so far: Just change how the CC functions. It would fit the current combat system very well, wouldn't be too difficult to program, and would create massive potential for boss fights.
Let's take this idea that popped into my head as an example:
Let's say Freeze was reworked into a snare that prevented movement and grounded the target, making them unable to be teleported. In addition, Fire spells used on the target didn't burn them, but freed them and applied Warm.
Now imagine a Void Frost Dragon boss that constantly spreads freezing and chilled. The fight would be about managing your fire spells and warm buffs to free your melee friends and stop the boss from chasing down the backline squishies unchallenged.
