Bizzard please postpone 3.0

I know this is a very odd request but think about the reasoning for a minute

when 2.0 was released the game was severely broken because classes such as mages/warlocks were so overpowered they were nearly indestructible by a mob of 4-5 people trying to kill them

I am sure this will be the case again only now you have a ranked Arena system where several of the top team combination already utilize these 2 classes