Anything but yet another swarm kite bard taking advantage of the strafe bug and running everyone out of the zone
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But, as far as for "there are gahzillions" it doesn't matter regarding druids imo. Someone is always looking for a port, someone for a sow, and even some for a heal in your group. If you play the class well, you won't have any real problems getting regular groups as you want. And when you don't want a group... you may even level faster
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An alt to the druid, maybe a ranger? Not enough of them if that matters to you. Under played class, and some ranger only equipment that sells for less. Ranger is more or less a melee druid if you haven't played it before, so mentioning ranger here. Yeah makes plats, thanks to tracking. Added benefit if you or your alt/main takes up tailoring (tracking), brewing (forage), baking (track and forage), most trades benefit from forage.
But really, just play what you want, with whatever end-game plan you have in mind. It's less about too few or too many, just some classes are more ideal to certain end-game goals (e.g. the high-end raiding grind etc.).