Total agreement. It's a travesty that Sages and Sorcerers have to stand there holding a useless weapon. It's bothered me since before the game was released, when I was just watching demos of the Taral V flashpoint and the consular just stood, making the same hand gesture over and over while the legendary, easily-recognizable Jedi weapon remained motionless in his other hand.
And I get that these classes are supposed to be primarily ranged, but the melee classes have ranged abilities. The knights and warriors have a lightsaber throw as well as Force Stasis/Choke. They have "Force Push". They have "Force Scream". None of those are melee abilities, but they're all used by melee classes. Why don't the Sages/Sorcerers get that kind of balance?
Heck, I'd be satisfied if we just got the same "Deflect" animation that the Guardian gets in 2.0, just to know that the lightsaber isn't completely worthless. Otherwise, yes, I'd like to be able to turn it off.