Your game is going to be ruined anyway when no one will group with people they don't know/trust to pull their weight. Or when you spend all night wiping to a boss in a hard mode flashpoint because one of your dps doesn't belong there. Anyone doing any hard modes should have a way to evaluate themselves on the fairly rigorous fights. Perhaps they made the meters not work in normal mode where anyone can just bang their keyboard and make it through.
Regardless, damage meters are coming, according to this post:
Even if they don't add them, it is only a matter of time before people figure out how to parse the information through packet sniffers.