If the community wants one, they should have it. I think any form of callout or overlay software would be bad, though.

However, the community must be responsible and own the fact that, as we are now, it will not be used to help players. It will be to avoid the threat of being banned for saying you are kicking people for low dps and select players out of a pool. That will mean less raid participation, and with the danger we start selecting in casual content too. They will be a much harder form of exclusion than gear checks in PF are. If ppl dont realize this and try to counter or mitigate these things, it will hurt players a lot. Everything will be skip soar.