It is amazing the twisted logic of some people. Here is something to think about. How does ONE person having the opportunity of being Tri spec take away from another? If someone wants to just be a combat rogue, how does my desire to Heal or Tank or DPS as my group needs me take away from your being a Combat Rogue? I am not playing with you am I? Don't I play for the sake of my own play and those of my friends?
People are funny. When they think that giving something MORE means less. Somehow, my playing Tri spec will mean something to them. This is not a zero sum game. It is a communal game made up of small groups and having the option of having more opportunities to enjoy does not take away from those that choose NOT to use all three or four specs.
As to the taking away from the uniqueness of the game. Isn't it MY choice to decide if I want to take away from MY uniqueness?
Think about it