I am torn on this issue.
While I can see how the Trolls will be able to access druidism as others have mentioned(natural affinity with nature), it is expected.
I was kinda stuck on the worgen issue.
I know in the Cataclysm video it is mentioned/implied (and shows) that the druids help the survivors of Gilneas. This may turn out to be the Druids 'training' the Worgen to help control their feral side and get in touch with nature(<Insert Cenarius training Malfurion in 'War of the Ancients' flashback here>). Or it may be a way of freeing them from their home dimension (what no space ship???).
http://www.wowwiki.com/Worgen Quote:
Cursed beings from another dimension, worgen only appear in Azeroth as the result of magical mishaps. True aberrations, they are accidentally drawn through temporary rift tunnels and deposited in this world with no apparent way of returning. Nothing is known about the worgen’s home realm, or even precisely how to spawn the rift tunnels through which they come.
There is lots of room to fill the back story with lore (both on the troll and worgen side).
The real question is will they be the new Huntard/DKtards? With no new Hero class being introduced...you never know.
The world (Azeroth) may not need more druids, but it is definitely getting some.
Edited, Aug 28th 2009 8:44am by RaideroftheBlade