The problems with the maps is that they are very narrow. A single spell can cover the whole width of the map (talking about the Z-axis), so it is of course very difficult in some situations to avoid some of these huge CCs. In a recent BSQ in which there were a lot of Sorcerers/Invokers/Summoners stacked in one team, I can say it was pretty much impossible to reach them when they covered the whole alley of one of the Fire Dragon map's side with their Blizzard / Penguins / Fire Emblems / Magnet / Chain Lightning / Quagmire / Rolling Stone.
something else that came to my mind as idea was the spam of any skills, doesnt matter which class, any class has some certain skills it just spams because it is on low cooldown and has the best efficiency, but what about decreasing the Damage of skills if they get used too often in a too short period of time, for sure this has to be individual for each class since some classes have overall higher cooldown and some lower or more skills and some less, this may bring more variety to the game and maybe knock ups and knock downs become usefull again because those skills are filler before the main skills are off debuff again.
This kind of thing is completely possible since it already exists on Destroyers' Atropine:
If you use it in less than 30 seconds you'll not be able to debuff every type of effect, and the 3rd shot will make you lose a lot of HP. I lose 33k with the 3rd shot with 93k HP.