Caveat, now that there are so many Super Skills, some of those which aren't tied to a Class Attribute, this fix may at first seem under-whelming. But please, think carefully about it after you read it.
Set the max for a Secondary Class Attribute to 9.
All of a sudden N/Rt isn't such an awesome Healer, just decent.
All of a sudden E/A isn't ruling the Farming scene, nor is A/E.
All of a sudden Me/N isn't the Elite Curser.
... W/D does more damage with Warrior weapons than Scythe.
... R/D, R/A, R/P, and R/W are better off as Rangers, than as Economical Melee.
I am sure that there are a lot more changes that this fix would bring about, but I don't want to waste time pointing them out. What I do know is that there has been a lot of talk about the uselessness of this class or the other, because some one else can do it better as a different primary. I do know that people are upset because they can't pug as a Rit or Derv, heck, my Rt and D toons have been parked for a LONG time.
Of course, this won't help regarding the issues of [skill]Cry of Pain[/skill] or [skill]"Save Yourselves!"[/skill] or other non-class based skills. It won't help balance the super-powers derived from Consumables either. But as I said, this one simple fix would, I think, dramatically recreate the landscape of the game that we all fell in love with. Something needs to and soon as it seems that the relationship is growing stale.
Thank You for Reading.
Flame On

As a side note, it may impact [skill]Cry of Pain[/skill] in that as a Me secondary, one's Hexes wouldn't be as effective, although, maybe not as much.
PS: I miss Gear Tanking.
PPS: I know that my join date is 02/07. Don't bother pointing that out.