There is indeed a fine line between success and failure when it comes to withering fire.
Not doing it correctly would pretty much make a class system void.
Doing it correctly will make the game more enjoyable for everyone (including lone wolfs) , promote teamwork aswell as promoting bigger battles , instead of little skirmishes around the map. It helps concentrate the fights and in the process kicks up a tonne of blaster bolts flying in all directions.
We have testing sessions of 10-15 people and it works well. I think it will really come into its own in servers with 32 - 64 .
"Government is the great fiction, through which everybody endeavours to live at the expense of everybody else."
Frédéric Bastiat