Do you honestly believe adding a penalty to players ((tanks and healers)) who refuse DF before a full group is sent in will solve anything? It wouldn't. It would make the situation worse and you know it.

Tanks and healers would switch to only grouping with FC/LS mates and queue for DF leaving the solo players once again on the forums bitching about the long queue times. SE would present another statement about how they know of the issue and will work on fixing it while saying to themselves that the player-base made this bed and needs to lie in it.