Depends on your clan and your world in all.
My clan is pretty small, yet we always have one 120+ Druid on for wyverns. If a Druid is on, then the rouges and warriors want to do wyverns, and then they call me or another support Mage because of lures.
Support lures can really help, they can almost reduce the time to kill a monster by half, yet if your clan or group chooses more dps then just a Mage who'll help you kill faster, that's your groups loss.
Getting to a level to actually help out with support lures are a pain. I've been playing since about Halloween, but I made my Mage after update 3. All 126 levels after the update, recieving little help from patches as they didn't give a unfathomable about mages.
As pigman said, Druids can be replaced by pots, but what can replace lures?
How much are we talking in lures? Just assasin or assasin, soldier, giants? how many points in each?