No, I wouldn't play it. I switched to WoW from Lineage because I could choose any class and actually be able to DPS if I wanted, level easier, quest etc..
In fact I think that instead of limiting roles - classes in WoW should have more options than they have now.. Remove pure DPS classes in the first place...
As for "support" class - I don't really see a place for them in WoW.. Would there only be one (let's say Bard).. Would that mean that all groups would need Bard class then? Or would it actually be bad to take him because we'd have 1 less DPS? What the standard 10 man composition be like? 2 tanks, buffer, 2 healers, 5 DPS? Or 3 healers 4 DPS?..