So,

i've seen so much said to change of procs, that will make one class useless, while other one won't be affected as much. Are you going to balance game? Let's do it properly.

1. Reduce hp and armor for rogues
2. increase skill damage and skill cd for mages
3. increase hp and taunt for warriors

Make every skill deplete more mana for warriors and rogues, so after one set of skill they'll need mage to support them with mana, or they will have to sacrifice damage pet for mana pet. Make expansion's minions and bosses tear both rogue and mage classes apart with 1-3 hits, so they'll finally get what they were asking for, warrior doing it's job moving in front of them taunting and healing team, keeping it alive.

Ofc, unhappy rogues will jump here with comments this is not "balance".