Well, the title is not entirely accurate, but I am not sure how to make it better. I basically want to ask EnWorlders if they think that there is a niche for another D&D core class (or perhaps if not a true core class than a base class?) and if so what focus should such a class have? Is there even potential for another core or base 'class group' (as in Warrior, Priest, Magic User and Skill User)?
Current core classes:
Barbarian
Bard
Cleric
Druid
Fighter
Monk
Paladin
Ranger
Rogue
Sorcerer
Wizard
Non-core base classes:
Favored Soul
Healer
Hexblade
Marshal
Psion
Psionic Warrior
Samurai
Shugenja
Sohei
Soulknife
Spirit Shaman
Swashbuckler
Warmage
Wilder
Wu Jen
Eberron core classes:
Artificer
Current core classes:
Barbarian
Bard
Cleric
Druid
Fighter
Monk
Paladin
Ranger
Rogue
Sorcerer
Wizard
Non-core base classes:
Favored Soul
Healer
Hexblade
Marshal
Psion
Psionic Warrior
Samurai
Shugenja
Sohei
Soulknife
Spirit Shaman
Swashbuckler
Warmage
Wilder
Wu Jen
Eberron core classes:
Artificer