i think the idea is very boring. its a role play game. the distinct lines between roles is what makes the game unique. to make everyone a hybrid would take away a great deal from the lore and imo result in less quality players ( jack of all trades, king of none). also, from a gearing pov, there would be a lot less to choose from, again taking away from the lore of the game. I belive there was a post early in cata about this ( ill look for it), basicly a blue saying they dont want to blur the lines between roles for the reasons i mentioned.
"Dear Santoro, Your wisdom has enlightened me. Thanks!"