Back in my day we were able to pass DPS checks in MMOs before anyone even knew what a parser was. Do you know how we did it? If your party failed a DPS check, everyone took responsibility for it. There was no "blame game." Every single person told themselves, "I need to get better so we don't wipe again," regardless if they were actually the ones holding the party back or not, and then proceeded to practice on other enemies or dummies.

The problem now-a-days is that kids have gotten so overly dependent on software to help them that they can no longer help themselves. A parser is like a wheelchair when you have a broken leg. Sure it makes the healing process quicker, but if you continue to use it you become dependent on it. Months later your legs start to atrophy because you stopped using them and you find that you can't function without the wheelchair anymore.

That being said, if this game MUST have some sort of DPS meter added, a decent compromise would be to have training dummies record hits while you are in combat with them and have it displayed. This way people have a way for self-improvement without inconveniencing everyone else.